split collector and checks needed for every host vs. whole cluster

[alfredodeza]

Some checks need to run once, like checking some value from ceph -s. Otherwise, a failing check for say 'nearfull: True` would show up in every single node being checked, which is not necessary.

In order to have split checks, the collector needs to be reworked as well to split cluster wide metadata gathering (like ceph -s).

• [x] split checks
• [ ] split collector

[alfredodeza]

The split checks are done as part of PR #97