Add a proper IPv4 sorter for jquery-tablesort

The default implementation provided with tablesorter uses a busted
regex and nonsensical formatter.  Add an explicit IPv4 parser/formatter
to Horizon and use it instead.

Closes-Bug: 1342266
Change-Id: I13c709f6171f8e7214b8a3ef15ddf441806df4c2
Merge "Add a proper IPv4 sorter for jquery-tablesort"