Foreman Maintain

Fixes #20974 - procedures for Katello-Service stop and start

Fixes #20870 - hammer ping check with default tag

Fixes #19715 - [Check] WARN if foreman-proxy is self-registered

Fixes #20798 - proper repo-id and VERSION from RPM by using facter

Fixes #20604 - katello-service feature to make services start/stop

Merge remote-tracking branch 'origin/master' into upgrade-workflow

Fixes #46 - isc dhcp configuration check

Merge remote-tracking branch 'origin/master' into upgrade-workflow

Newly added config constants for packaging.

Support for run_once procedures and repositories setup

Configure repositories and update packages

Update the satellite upgrade to new code

Poor man's maintanence mode though ip tables

Full upgrade scenario

This commit intoroduces more structured upgrade scenario consisting of
this scenarios:

• pre_upgrade_check - non-modifying checks: is the system ready?
• pre_migrations - modifying procedures before source update
• migrations - source update and main migrations...

Fixes #59 - missing error for hammer-config file

REF #16 - compress csv backup with bzip2

RFE #16 - Delete invalid tasks

Added spinner to enable sync_plans

Fixes #19 - Handled sync plans before & after upgrade

With this commit, below changes included -
1. Two new checks
- Disable sync plans before upgrade
- Enable sync plans after upgrade which are disabled previously.

2. Created directory lib/foreman_maintain/storage in which...

Add tests for tasks paused check and additional procedures

Check count of paused tasks and offer next steps

Turn hammer feature into a utils class

After looking more into this, I think the util class is actually better
fit for the hammer case. I've also removed the detection of the
credentials from hammer configuration, as we actually don't need
the credentials by our own.

Introduce hammer as a feature

Shellescaping and password filtering support in system helper

Support code for allowing filering out sensitive data from logs
+ properly escaping user-specified variables (such as password)

Extract metadata DSL to separate namespace

Having the DSL methods directly on the classes caused issues when
needing to query the metadata later.

Corrected the syntax.

CLI basic structure

Refactor the choice of next steps

Update real definitions based on latest changes in lib

WIP: definitions

WIP check definitions

WIP: check scenarios

Add rubocop

First version doing something: feature detection