[azure_rm_publicipaddress] Add support for setting reverse_fqdn on public IPv4 addresses

[tsmithCmdlnk]

SUMMARY

Microsoft supports setting the RDNS or Reverse DNS value for public IPv4 addresses, docs. Currently the return values for both azure_rm_publicipaddress and azure_rm_publicipaddress_info support getting the currently set reverse_dns value via the dns_settings object but there is no way to actually set that field without resorting to azure_rm_resource.

ISSUE TYPE

• Feature Idea

COMPONENT NAME

azure_rm_publicipaddress

[Fred-sun]

Add by #1655