Signal Handler is added

Signal handler is added for the graceful exit of the
test framework.

Fixes: #208
Signed-off-by: Nishith Vihar Sakinala <nsakinal@redhat.com>

core/redant_main.py

@@ -5,10 +5,12 @@
 3) Invocation of the test_runner.
 """
 
+import signal
 import sys
 import time
 import datetime
 import argparse
+from signal_handler import signal_handler
 from parsing.params_handler import ParamsHandler
 from test_list_builder import TestListBuilder
 from test_runner import TestRunner
@@ -94,4 +96,8 @@ def main():
 
 
 if __name__ == '__main__':
+
+    signal.signal(signal.SIGINT, signal_handler)
+    signal.signal(signal.SIGTSTP, signal_handler)
+
     main()

core/signal_handler.py

@@ -0,0 +1,18 @@
+"""
+This file consists of functions for handling 
+signals. Signal handling is required for the
+graceful exit of the test framework
+"""
+
+def signal_handler(signalNumber, frame):
+    """
+    Function for handling signal and raising the
+    SystemExit call for graceful exit of the test 
+    framework
+    Args:
+        signalNumber (int): The signal number of the signal caught
+        frame: current stack frame, None or stack frame object.  
+    """
+    print("Signal Received",signalNumber)
+    raise SystemExit('Exiting...')
+    return