Add command to bin/navuser to remove user

bin/navuser

@@ -77,6 +77,19 @@ def adduser(args):
     print(msg % args.login, file=sys.stderr)
 
 
+def removeuser(args):
+    try:
+        args.login.delete()
+    except args.login.DoesNotExist:
+        print(
+            "User %s is not registered, cannot remove" % args.login.login,
+            file=sys.stderr,
+        )
+        sys.exit(1)
+    else:
+        print("User %s has been removed" % args.login.login, file=sys.stderr)
+
+
 def adminify(args):
     action = args.action
     try:
@@ -216,6 +229,12 @@ def parse_args():
     )
     addparser.set_defaults(func=adduser)
 
+    removeparser = subparsers.add_parser('remove', help='Removes a user')
+    removeparser.set_defaults(func=removeuser)
+    removeparser.add_argument(
+        'login', type=usergetter, help="The login name of the user"
+    )
+
     adminifyparser = subparsers.add_parser(
         'admin', help='Sets whether an existing user belongs to the admin group'
     )