Description of problem:
Traceback due to removal of tracer plugin. I'm filing against dnf because the component field didn't seem to want to accept the plugin package name ...

Version-Release number of selected component (if applicable):
1.1.10-1.fc24

How reproducible:
Remove plugins until one causes a traceback from dnf.

Steps to Reproduce:
1. dnf install python3-dnf-plugins-extras-\*
2. dnf erase python3-dnf-plugins-extras-snapper # (succeeded)
3. dnf erase python3-dnf-plugins-extras-tracer  # (traceback, below)

Actual results:

[root@william ~]# dnf erase python3-dnf-plugins-extras-tracer
Dependencies resolved.
================================================================================================
 Package                                 Arch         Version              Repository      Size
================================================================================================
Removing:
 python2-psutil                          x86_64       3.2.1-5.fc24         @fedora        530 k
 python2-tracer                          noarch       0.6.11-1.fc24        @updates       325 k
 python3-dnf-plugins-extras-tracer       noarch       0.0.12-3.fc24        @updates       9.8 k

Transaction Summary
================================================================================================
Remove  3 Packages

Installed size: 865 k
Is this ok [y/N]: y
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
  Erasing     : python3-dnf-plugins-extras-tracer-0.0.12-3.fc24.noarch                      1/3 
  Erasing     : python2-tracer-0.6.11-1.fc24.noarch                                         2/3 
  Erasing     : python2-psutil-3.2.1-5.fc24.x86_64                                          3/3 
  Verifying   : python3-dnf-plugins-extras-tracer-0.0.12-3.fc24.noarch                      1/3 
  Verifying   : python2-tracer-0.6.11-1.fc24.noarch                                         2/3 
  Verifying   : python2-psutil-3.2.1-5.fc24.x86_64                                          3/3 

Removed:
  python2-psutil.x86_64 3.2.1-5.fc24                       python2-tracer.noarch 0.6.11-1.fc24  
  python3-dnf-plugins-extras-tracer.noarch 0.0.12-3.fc24  

DDEBUG:dnf:Cleaning up.
SUBDEBUG:dnf:
Traceback (most recent call last):
  File "/usr/lib/python3.5/site-packages/dnf/cli/main.py", line 60, in main
    return _main(base, args)
  File "/usr/lib/python3.5/site-packages/dnf/cli/main.py", line 120, in _main
    ret = resolving(cli, base)
  File "/usr/lib/python3.5/site-packages/dnf/cli/main.py", line 159, in resolving
    base._plugins.run_transaction()
  File "/usr/lib/python3.5/site-packages/dnf/plugin.py", line 82, in fn
    dnf.util.mapall(operator.methodcaller(method), self.plugins)
  File "/usr/lib/python3.5/site-packages/dnf/util.py", line 183, in mapall
    return list(map(fn, *seq))
  File "/usr/lib/python3.5/site-packages/dnf-plugins/tracer.py", line 70, in transaction
  File "/usr/lib64/python3.5/subprocess.py", line 950, in __init__
    restore_signals, start_new_session)
  File "/usr/lib64/python3.5/subprocess.py", line 1544, in _execute_child
    raise child_exception_type(errno_num, err_msg)
FileNotFoundError: [Errno 2] No such file or directory: 'tracer'
[Errno 2] No such file or directory: 'tracer'
CRITICAL:dnf:[Errno 2] No such file or directory: 'tracer'