py/cli: add --version option

This patch implements the '--version' for the crit tool.

$ crit --version
3.17

Signed-off-by: Radostin Stoyanov <rstoyanov@fedoraproject.org>

lib/py/cli.py

@@ -364,6 +364,7 @@ def main():
     desc = 'CRiu Image Tool'
     parser = argparse.ArgumentParser(
         description=desc, formatter_class=argparse.RawTextHelpFormatter)
+    parser.add_argument('--version', action='version', version=pycriu.__version__)
 
     subparsers = parser.add_subparsers(
         help='Use crit CMD --help for command-specific help')

test/others/crit/test.sh

@@ -101,6 +101,8 @@ function run_test2 {
 	${CRIT} x ./ rss || exit 1
 }
 
+${CRIT} --version
+
 gen_imgs
 run_test1
 run_test2