bgpd: Large-communities CLI accepts configurations sans attributes.

bgpd: Large-communities CLI accepts configurations sans attributes.

BGP large-communities configuration CLI is successful even if
the command is configured without any attributes.
For ex., the below commands are successful.
         1) "bgp large-community-list standard TEST permit"
         2) "bgp large-community-list standard TEST deny"

The CLI definitions that allow these erroneous configurations need to be removed.

Signed-off-by: NaveenThanikachalam nthanikachal@vmware.com