Add cmd entry point for verify_tempest_config

This commit moves the verify_tempest_config script from the tools dir
to tempest.cmd and adds a pbr entry point for the script. This means
that the script will in effect be a packaged binary for tempest.

Partially implements bp config-verification

Change-Id: I75b9743a8117d55c6c445db05eb39404b5708624

setup.cfg

@@ -17,6 +17,10 @@ classifier =
     Programming Language :: Python :: 2
     Programming Language :: Python :: 2.7
 
+[entry_points]
+console_scripts =
+    verify-tempest-config = tempest.cmd.verify_tempest_config:main
+
 [build_sphinx]
 all_files = 1
 build-dir = doc/build

tempest/cmd/verify_tempest_config.py

@@ -312,7 +312,7 @@ def parse_args():
     return args
 
 
-def main(argv):
+def main():
     print('Running config verification...')
     opts = parse_args()
     update = opts.update
@@ -343,4 +343,4 @@ def main(argv):
 
 
 if __name__ == "__main__":
-    main(sys.argv)
+    main()