Action 'as-is' means that existing BGP Community
attribute is unchanged. 'remove' - all BGP
Communities are removed from an update.
'append' - existing BGP Communities are appended with
the list of communities defined in wfIpBgp4AnnounceCommunity.
'replace' - existing BGP Communities are are replaced
with those defined in wfIpBgp4AnnounceCommunity.