Expand the local buffer to hold ipv6 address string
Expand the local buffer to hold ipv6 address string

The buffer that is used to hold the string that represents the ipv6
address is only 16bytes strong. Expand it to INET6_ADDRSTRLEN (or
46 bytes) in size.

Change-Id: I063f6f85ef9a0a0021d21b5602b40383d0382a1b
Closes-BUG: #1543389

codilime/contrail-vrouter,codilime/contrail-vrouter,codilime/contrail-vrouter,codilime/contrail-vrouter