Allow sending ctrl+c multiple times to kill a command

Change-Id: I67bdc63beccbdde3b082948cff8246b37e70d123
(cherry picked from commit 18676a6f5f5ea0f17446e5a1b0cf36e9c31262c7)
diff --git a/TestON/drivers/common/cli/onosdriver.py b/TestON/drivers/common/cli/onosdriver.py
index ef87e00..08138c2 100755
--- a/TestON/drivers/common/cli/onosdriver.py
+++ b/TestON/drivers/common/cli/onosdriver.py
@@ -2673,8 +2673,7 @@
         except pexpect.TIMEOUT:
             main.log.exception( self.name + ": TIMEOUT exception found in onosDiagnostics" )
             main.log.error( self.name + ":    " + self.handle.before )
-            self.handle.send( "\x03" )  # Control-C
-            self.handle.expect( self.prompt )
+            self.exitFromCmd( self.prompt, 100 )
             return main.FALSE
         except pexpect.EOF:
             main.log.error( self.name + ": EOF exception found" )