Changed to show Red Hat Updates filtered by region.

https://bugzilla.redhat.com/show_bug.cgi?id=1159948
Remove redundant Object#to_s within string interpolation

rubocop -a --only Lint/StringConversionInInterpolation -d
Fixed a few issues in Chargeback Explorer

1. Fixed sorting and paging in Rates list
2. Fixed "Abandon Changes" prompt appearing even for no changes in the
   form
Remove unreachable code from several years ago.

rubocop --only Lint/UnreachableCode -d

lib/Verbs/implementations/VmdbOps.rb:102:6: W: Lint/UnreachableCode: Unreachable code detected.
      return ost.args[0]
     ^^^^^^^^^^^^^^^^^^
Merge pull request #1103 from h-kataria/RH_updates_filter_by_region

Changed to show Red Hat Updates filtered by region.
Merge pull request #1125 from jrafanie/redundant_use_of_to_s_in_interpolation

Remove redundant Object#to_s within string interpolation
Merge pull request #1127 from AparnaKarve/cb_known_issues

Fixed a few known issues in Chargeback Explorer
Merge pull request #1126 from jrafanie/fix_vmdb_ops_unreachable_code

Remove unreachable code from several years ago.