enhance post-sync skip detection with simple count check
Description of problem:
Currently we rely on pulp to tell us about updated or added units on a sync to determine whether or not to index all the content. We can probably enhance this a bit by simply checking the counts within the repo to see if it matches what we think should be in the repo. This check should take less than a second and would catch the case where a sync pulled in packages but was not indexed the first time (such as if the publish errored, or a scheduled sync completion was missed).
This would reduce the number of situations where a user is syncing but not seeing any updated packages.