bgpd: remove ip prefix from as-path, <large,ext>community-list

bgpd: remove ip prefix from as-path, <large,ext>community-list

The existing commands "ip as-path", "ip community list", "ip extcommunity
list" & "ip largecommunity list" is used to configure both for ipv4 and
ipv6. So the prefix "ip" is removed from these commands.
All the configuration, show related configuration, show running config
& boot up with write memory is also verified with the provided fix.

Signed-off-by: Sarita Patra <saritap@vmware.com>