Added ping_check and ssh_check functions and use it in exercise.sh

Change-Id: I69d41c9db527f60f250b6af36b2d8e9d0dd39684
diff --git a/openrc b/openrc
index 08ef98b..0a6a215 100644
--- a/openrc
+++ b/openrc
@@ -72,3 +72,6 @@
 # set log level to DEBUG (helps debug issues)
 # export KEYSTONECLIENT_DEBUG=1
 # export NOVACLIENT_DEBUG=1
+
+# set qunatum debug command
+export TEST_CONFIG_FILE=/etc/quantum/debug.ini