GUI:Added elements for Power page.

Changes:
   - Added additional elements related to test cases below:
Verify Navigation To Power Page
Verify Existence Of All Buttons In Power Page
Tested:
  - Ran the test cases from sandbox successfully

Change-Id: I0494184075a2c9debd3f4a5a1b2d795890f4506e
Signed-off-by: sarandev3 <saranyad@in.ibm.com>
diff --git a/gui/data/gui_variables.py b/gui/data/gui_variables.py
index dd92460..e78283f 100644
--- a/gui/data/gui_variables.py
+++ b/gui/data/gui_variables.py
@@ -101,6 +101,7 @@
         "//*[@data-test-id='nav-button-resource-management']"
     )
     xpath_power_sub_menu = "//*[@data-test-id='nav-item-power']"
+    xpath_power_link = "//a[@href='#/resource-management/power']"
     xpath_power_heading = "//h1[contains(text(), 'Power')]"
     xpath_success_message = "//*[contains(text(),'Success')]"