<suggestions> record type as attr too

Eventually we will need to serialize suggestions and provide them via an
API. Using to_json the class of the suggestion is not saved, so record
it as an attribute too.
<oo-admin-chk> test for node hostname changes

Adds a report for the following situation:
a) User adds a gear to a node
b) Admin changes the hostname of the node, making the app essentially
inaccessible by the user via broker and causing loads of other problems.

While looking through all gears the nodes report, this now checks that
the node hostname matches what is in the DB for the gear. This could
briefly give spurious failures if a gear is being moved at the time, but
should otherwise be considered a legitimate problem.
<capacity suggestions> bug 1004686

https://bugzilla.redhat.com/show_bug.cgi?id=1004686
Testers noted that the fill algorithm for putting new nodes in districts
was kind of weird. It was attempting to keep from filling districts
prematurely, but this was the wrong approach. What we do now is default
to a low active percentage setting that will result in a fairly small
district size target. Then, we suggest filling existing districts before
creating new districts as full as needed.
Merge pull request #3906 from sosiouxme/bz1004686

Merged by openshift-bot