remove unnevessary stuff
1098891: Update repos, persisting local settings when possible

remove tests that are no longer valid
1076359; Removes the extra l from --remove all
Merge pull request #948 from candlepin/csnyder/man_page_typo

1076359; Removes the extra l from --remove-all
Merge pull request #942 from candlepin/ckozak/remove_pyxml_date

remove unnevessary stuff
1098891: Apply overrides to mutable properties
Cache overrides when RepoFile is written

This way we can verify whether or not the source of a repo value
was an override that has been removed, vs a manual edit
correct repos --list behavior
update existing repos with non-default overrides
Some minor comment updates.
Merge pull request #947 from candlepin/ckozak/repos_update

1098891: Update repos, persisting local settings when possible
Automatic commit of package [subscription-manager] release [1.11.7-1].
Don't rewrite redhat.repo unless it has changed
refresh ent_dir after adding/deleting certs