Description of problem:
Bootstrap script should run commands with --force to successfully handle situation when you re-run script or you have already registerred host

Version-Release number of selected component (if applicable):
@Sat6.2.0-Snap14
katello-client-bootstrap-1.1.0-1.el7sat.noarch

How reproducible:
always

Steps to Reproduce:
1a. Have a host regged to CDN
2a. Run ./bootstrap.py and watch it fail with "subscription-manager register..."
[ERROR], [2016-06-07 06:28:08], EXITING: [/usr/sbin/subscription-manager register --org 'Default_Organization' --name '<CLIENT_FQDN>' --activationkey 'My Activation Key'  --serverurl=https://<SAT_FQDN>:443/rhsm --baseurl=https://<SAT_FQDN>/pulp/repos] failed to execute properly.
This system is already registered. Use --force to override

1b. Have a host that ha bootstrap ca certs installed
2b. Run ./bootstrap.py and watch it fail with "rpm -Uvh <bootstrap-ca-certs>..."
[ERROR], [2016-06-06 08:49:13], EXITING: [rpm -Uvh http://<SAT_FQDN>/pub/katello-ca-consumer-latest.noarch.rpm] failed to execute properly.
Retrieving http://<SAT_FQDN>/pub/katello-ca-consumer-latest.noarch.rpm
Preparing...                ##################################################
	package katello-ca-consumer-<SAT_FQDN>-1.0-1.noarch is already installed

Actual results:
failure 

Expected results:
success

Additional info:
rpm -Uvh --force http://<SAT_FQDN>/pub/katello-ca-consumer-latest.noarch.rpm would handle situation when rpm is already installed, RC=0