Foreman » Smart Proxy

Fixes #17906 - Move {create,remove}_*_record to dns_common

Before most DNS providers had pretty much exact copies of these
functions. This removes duplication and allows for much simpler plugins.

In doing so it also fixes #17879 by adding CNAME support to the nsupdate...

Fixes #18149 - Duplicates due to OU in certnames

Adds test case for certs with OU entries in their subjects.

Fixes #13318 - Revoked certs always have state 'revoked'

Serial numbers from the CRL are now compared correctly to the inventory
as integers.

Fixes #18071 - Deleting missing records doesn't generate errors

fixes #17856 - support multiple dhcp records for same ip

fixes #17868 - dhcp: convert next-server ip correctly

Refs #17037 - Fix deprecation warning in dnscmd

522231bf3e4c918ee821a73acb3f70459ca57791 deprecated the use of
ptr_record_conflicts with IPs, but didn't update this implementation.

Fixes #17554 - inotify events can't overflow the observer anymore

Fixes #17045 - hostgroup templates URLs proxied correctly

fixes #17387 - SubnetService#find_subnet has constant time lookup

find_subnet is now approximately constant with the number of subnets
configured, using hash lookups of possible network prefixes for the
given IP address until the most specific prefix is found. Benchmark...