Added test cases to validate remote logging server page in server health

Added Test Cases:
    - Verify Existence Of All Buttons In Remote Logging Server Page
    - Verify Existence Of All Input Boxes In Remote Logging Server Page
    
Other changes: are added new keywords and variable changes.

Signed-off-by: Anusha Dathatri <adathatr@in.ibm.com>
Change-Id: I173a57bf484d6ef15fb53687dc96481c3a4d9c5d
diff --git a/gui/data/resource_variables.py b/gui/data/resource_variables.py
index efa4d4f..0cd005c 100644
--- a/gui/data/resource_variables.py
+++ b/gui/data/resource_variables.py
@@ -19,6 +19,8 @@
     xpath_cancel_button = "//button[contains(text(),'Cancel')]"
     xpath_save_setting_button = "//button[contains(text(),'Save settings')]"
     xpath_save_button = "//button[contains(text(),'Save')]"
+    xpath_remove_button = "//button[contains(text(),'Remove')]"
+    xpath_add_button = "//button[@type='submit']"
 
     xpath_select_button_warm_reboot = \
         "//*[@id='power__warm-boot']"