Description of problem: Satellite-installer failed with argument error while upgrading the satellite from 6.7 to 6.8 

Version-Release number of selected component (if applicable):
6.8

How reproducible:
always

Steps to Reproduce:
1. Prepared the environment to perform the satellite-upgrade from 6.7 to 6.8 
2. Configure all the repository
3. Execute the pre-check and it has completed successfully.

# foreman-maintain upgrade run --whitelist="disk-performance,repositories-validate, repositories-setup" --target-version 6.8 -y
Checking for new version of satellite-maintain...
Nothing to update, can't find new version of satellite-maintain.
Running Checks before upgrading to Satellite 6.8
================================================================================
Skipping pre_upgrade_checks phase as it was already run before.
To enforce to run the phase, use `upgrade run --phase pre_upgrade_checks`



Running Procedures before migrating to Satellite 6.8
================================================================================
disable active sync plans: 
\ Total 0 sync plans are now disabled.                                [OK]      
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Add maintenance_mode chain to iptables:                               [OK]
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Stop applicable services: 

Stopping the following service(s):
rh-mongodb34-mongod, postgresql, qdrouterd, qpidd, squid, pulp_celerybeat, pulp_resource_manager, pulp_streamer, pulp_workers, smart_proxy_dynflow_core, tomcat, dynflowd, elasticsearch, httpd, puppetserver, foreman-proxy
\ All services stopped                                                [OK]      
--------------------------------------------------------------------------------


Running preparation steps required to run the next scenarios
================================================================================
Check if tooling for package locking is installed:                    [OK]
--------------------------------------------------------------------------------


Running Migration scripts to Satellite 6.8
================================================================================
Setup repositories:                                                   [SKIPPED]
--------------------------------------------------------------------------------
Unlock packages:                                                      [OK]
--------------------------------------------------------------------------------
Update package(s) :                                                   [OK]
--------------------------------------------------------------------------------
Procedures::Installer::Upgrade:                                       [FAIL]
Failed executing LANG=en_US.utf-8 satellite-installer, exit status 1:
 Executing: foreman-maintain packages -h
Executing: foreman-maintain packages is-locked --assumeyes
Executing: foreman-maintain service start --only=postgresql
could not change directory to "/root"
/usr/share/foreman-installer/hooks/boot/03-foreman-maintain-extensions.rb:25:in `stop_services': wrong number of arguments (given 0, expected 1) (ArgumentError)
	from /usr/share/foreman-installer/hooks/pre/30-el7_upgrade_postgresql.rb:4:in `postgresql_12_upgrade'
	from /usr/share/foreman-installer/hooks/pre/30-el7_upgrade_postgresql.rb:20:in `block (4 levels) in load'
	from /opt/theforeman/tfm/root/usr/share/gems/gems/kafo-4.1.0/lib/kafo/hooking.rb:34:in `instance_eval'
	from /opt/theforeman/tfm/root/usr/share/gems/gems/kafo-4.1.0/lib/kafo/hooking.rb:34:in `block (4 levels) in load'
	from /opt/theforeman/tfm/root/usr/share/gems/gems/kafo-4.1.0/lib/kafo/hook_context.rb:16:in `instance_exec'
	from /opt/theforeman/tfm/root/usr/share/gems/gems/kafo-4.1.0/lib/kafo/hook_context.rb:16:in `execute'
	from /opt/theforeman/tfm/root/usr/share/gems/gems/kafo-4.1.0/lib/kafo/hooking.rb:51:in `block in execute'
	from /opt/theforeman/tfm/root/usr/share/gems/gems/kafo-4.1.0/lib/kafo/hooking.rb:49:in `each'
	from /opt/theforeman/tfm/root/usr/share/gems/gems/kafo-4.1.0/lib/kafo/hooking.rb:49:in `execute'
	from /opt/theforeman/tfm/root/usr/share/gems/gems/kafo-4.1.0/lib/kafo/kafo_configure.rb:424:in `run_installation'
	from /opt/theforeman/tfm/root/usr/share/gems/gems/kafo-4.1.0/lib/kafo/kafo_configure.rb:155:in `execute'
	from /opt/theforeman/tfm/root/usr/share/gems/gems/clamp-1.1.2/lib/clamp/command.rb:63:in `run'
	from /opt/theforeman/tfm/root/usr/share/gems/gems/kafo-4.1.0/lib/kafo/kafo_configure.rb:118:in `run'
	from /opt/theforeman/tfm/root/usr/share/gems/gems/clamp-1.1.2/lib/clamp/command.rb:132:in `run'
	from /opt/theforeman/tfm/root/usr/share/gems/gems/kafo-4.1.0/lib/kafo/kafo_configure.rb:162:in `run'
	from /usr/sbin/satellite-installer:8:in `<main>'
--------------------------------------------------------------------------------
Scenario [Migration scripts to Satellite 6.8] failed.



Actual results:
Upgrade failed.

Expected results:
upgrade should complete successfully.

Additional info: