Auto-heal current setup when running the script

[Rocco83]

bootstrap.py has to be able to repair the installation of the subscriptions, puppet, katello, rex, and whatever else will be in the future implemented.
Continuing from the possible scenario given by Evgeni, #218 (comment))
we can see it as
5. System is on Katello/Satellite6 and i want to fix the installation.

Suggested flag:
--fix-configuration

Some scenarios:

• registered system has to be moved to another capsule (likely covered by Add capsule migration option #168 )
• registered system has to be reinstalled from scratch because of some unrecoverable error (ie disk error, backup not done / not consistent)
• registered system in some inconsistent status (maybe manual OS admin error), and we want to fix the Katello/Satellite6 setup. Some example
• • puppet certificate deleted
• • goferd ID removed
• • public ssh key deleted
• • Katello/Satellite6 database from the above entry with wrong status

Some ideas/items for discussion:

• able to identify the original configuration requested (ie, runned with katello and without rex).
• fix remote DB: check all of the (katello|satellite) entry (ie, check the Katello ID working, check the puppet certificate, ...)
• fix local configuration (ie, if puppet is not working, regenerate the certificate and delete the old one if needed)
• From Rich's comment [RFE] Migrating a system from RHSM or SAM using the bootstrap script should not require the --force option.  #217 (comment)

subscription-manager does have the --consumerid option (for example) that allows a system to (re)register to an existing profile. I dont think puppet has an equivalent functionality.

I think this is a huge one, that would likely extend also the scope of bootstrap.py.
Of course for discussion about it!