Fix specs that reference the wrong fields in ops_controller/common

@dclarizio Please review...I think this fixes the sporadic failures we are seeing, notably in #745 and #725 .

The tests in question are supposed to be testing what happens when one checks a "storage" checkbox in the UI and how it is expected to affect `@edit`.  However, it seems like there was a few typos and it is checking the wrong thing.  The first spec checks the `__storage` box, but then it verifies the `:hosts` key in `@edit`, which is wrong.  The second spec is supposed to uncheck the `__storage` box, but instead unchecks a `__host` box...in addition it verifies against the `:hosts` key in `@edit` instead of `:storage`, which is wrong.

I believe the test is sporadically failing because it is comparing storage ids to host ids, and depending on luck and/or test ordering those id numbers will happen to line up.  (Thanks @blomquisg for the insight on that last point)

cc @kbrock @jrafanie 
@Fryguy and I talked about this offline ... this part was thoroughly confusing.

This test and the one below seem to be talking about storages.  But, this test looked for hosts after it submitted a checkbox for a storage.  And, while the test says "should select", the test says "should_not include".

Guessing it was just a copy-paste typo.  And, the fact that it was looking to exclude a storage object from a list of hosts *may* have helped with the sporadic nature of the failures.