Eliminating use of Apache Karaf CLI client and of ONOS_USE_SSH env. variable.

All CLI access is now through the raw SSH client.
To enable passwordless access, the 'onos-user-key' tool should be used to add user keys.
Added 'onos-user-password' tool in the similar vein and usage as the 'onos-user-key' tool.

Change-Id: Ic5482fc8012369edc818691402ba45d13f130452
diff --git a/tools/test/bin/onos-check-nodes b/tools/test/bin/onos-check-nodes
index 69187b6..5433f38 100755
--- a/tools/test/bin/onos-check-nodes
+++ b/tools/test/bin/onos-check-nodes
@@ -6,7 +6,7 @@
 aux=/tmp/stc-$$.log
 trap "rm -f $aux $aux.1 $aux.2 2>/dev/null" EXIT
 
-onos ${1:-$OCI} "onos:nodes" | grep -v /bin/client > $aux
+onos ${1:-$OCI} "onos:nodes" > $aux
 cat $aux
 
 # Normalize the nodes