Fix undeclared throwable exception while executing 'nodetool netstats localhost'

Patch by Vishal Mehta and Carl Yeksigian, reviewed by Carl Yeksigian for
CASSANDRA-8122
Merge branch 'cassandra-2.0' into cassandra-2.1
Fix undeclared throwable exception while executing 'nodetool netstats localhost'

Patch by Vishal Mehta and Carl Yeksigian, reviewed by Carl Yeksigian for CASSANDRA-8122
Merge branch 'cassandra-2.1' into trunk