Adding support to wait for and verify the OS.

This change consists of the following new keywords:

OS Check
Wait for OS

We have also added some definitions in resource.txt

Signed-off-by: Michael Walsh <micwalsh@us.ibm.com>
Change-Id: If8bd6f2889587b514c0b1d21e8d2086e96d40f83
diff --git a/lib/resource.txt b/lib/resource.txt
index 6940d22..ecfea7a 100755
--- a/lib/resource.txt
+++ b/lib/resource.txt
@@ -27,6 +27,12 @@
 ${SSH_PORT}         ${EMPTY}
 ${HTTPS_PORT}       ${EMPTY}
 
+# OS related parameters.
+${OS_HOST}          ${EMPTY}
+${OS_USERNAME}      ${EMPTY}
+${OS_PASSWORD}      ${EMPTY}
+${OS_WAIT_TIMEOUT}  ${15*60}
+
 *** Keywords ***
 Get Inventory Schema
     [Arguments]    ${machine}