[foreman] Collect puma status and stats

[pmoravec]

Collect foreman-puma-status and 'pumactl [gc-|]stats', optionally using
SCL (if detected).

Resolves: #2712

Signed-off-by: Pavel Moravec pmoravec@redhat.com

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[pmoravec]

We can utilise SCLPlugin.convert_cmd_scl method but:

• we dont need to modify PATH here
• it might be a bit overkill to use the class at all, if majority of (future) execution will not use SCL at all

[ekohl]

I see you already use foreman-puma-status (good!). If it's easier, we can probably introduce wrappers for other Puma things. I suspect other users may find them useful too.

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