(PUP-1564) add :uninstall_options feature to package rpm provider
(PUP-1564) Add uninstall_options to RPM provider docs
Merge pull request #2319 from jhoblitt:feature/rpm_provider_uninstall_options

Merged with a fixup to spec tests to account for changes in abfc76c. Added an
update to generalize install options documentation from bb829da to cover
uninstall options as well.

(PUP-1564) Add uninstall_options to RPM provider docs
(PUP-1564) add :uninstall_options feature to package rpm provider