Optionally ignore port number in mount-table name when picking from initialized uri

Currently mount-table name is used from uri's authority part. This authority part contains IP:port/HOST:port. Some may configure without port as well.

ex: hdfs://ns1 or hdfs://ns1:8020

It may be good idea to use only hostname/IP when users configured with IP:port/HOST:port format. So, that we will have unique mount-table name in both cases.