added options to mq-create command to specify username and password for network connector

Current mq-create required the following 3 steps to specify username & password for the generated networkConnector

    mq-create --group mq-east --networks mq-west mq-east-broker
    profile-edit -p org.fusesource.mq.fabric.server-mq-east-broker/network.userName=admin mq-east-broker
    profile-edit -p org.fusesource.mq.fabric.server-mq-east-broker/network.password=admin mq-east-broker

Patched command allows you to now do the following

    mq-create --group mq-east --networks mq-west --networks-username admin --networks-password admin mq-east-broker