openshift.ks, configure_activemq: Mark vars local

Declare networkConnectors and authenticationUser_amq as local variables.
openshift.ks: Improve descriptions for replication

Clarify that ports may be specified for CONF_DATASTORE_REPLICANTS and must
not be specified for CONF_ACTIVEMQ_REPLICANTS.
openshift.ks: Fix replication for routing plug-in

Fix configure_routing_plugin to configure the routing plug-in with all
ActiveMQ replicants instead of only the first.

This commit fixes bug 1109052.
openshift.ks: Configure ActiveMQ redelivery

Modify configure_activemq to configure redelivery for the routinginfo
queue, which may be used by the ActiveMQ routing plug-in.

This commit fixes bug 1132208.
openshift.ks: Always set routing_plugin_user/pass

In set_defaults, always set the routing_plugin_user and routing_plugin_pass
variables instead of setting them only when installing the "broker"
component.  These variables are used when configuring ActiveMQ and so may
be used even if the "broker" component is not being configured, and in any
case, set_defaults should set variables unconditionally for simplicity.

This commit fixes bug 1132209.