Make ClearDesc platform independent

Script previously just cleared descriptions for port ranges on a 9396.
Now polls for list of interfaces and clears them all.

Author: James Caesar

ClearDesc.py

@@ -2,11 +2,14 @@
 from nxapi_base import NXOS
 
 def main(args):
-    n9k = NXOS(args.mgmt_ip)
-    n9k.PromptCreds()
-    commands = ['int m0 ;no desc', 'int e1/1-48 ;no desc', 'int e2/1-12 ;no desc', 
-    'int Po1 ;no desc']
-    n9k.cli_conf(commands)
+    device = NXOS(args.mgmt_ip)
+    device.PromptCreds()
+    intfstatus = device.cli_show('show interface status')
+    intflist = intfstatus['TABLE_interface']['ROW_interface']
+    commands = []
+    for intf in intflist:
+        commands.append("int {} ;no description".format(intf['interface']))
+    device.cli_conf(commands)
     print "Descriptions Cleared."
 
 if __name__ == '__main__':