refactor script for commenting on launchpad bugs prior to move to project-config

When we move the release tagging scripts to the project-config
repository, they will need to have minimal dependencies and shouldn't
need to import other local modules. Move the launchpad code needed by
launchpad_add_comment.py into the file, and move the file out of the
cmds subdirectory to be a regular script instead.

Change-Id: Ie004c2a14100611d4b7c1604dcf7f465a6f0246c

launchpad_add_comment.py

@@ -18,12 +18,13 @@
 # under the License.
 
 from __future__ import print_function
+
 import argparse
+import os
 
+import launchpadlib.launchpad
 import lazr.restfulclient.errors
 
-from releasetools import launchpadutils
-
 
 def main():
     # Parameters
@@ -32,14 +33,33 @@ def main():
                         default='Comment added by add_comment')
     parser.add_argument('--content', help='The comment content',
                         default='Comment added by add_comment')
-    launchpadutils.add_cli_arguments(parser)
+    lp_grp = parser.add_argument_group('launchpad')
+    lp_grp.add_argument(
+        "--test",
+        action='store_const',
+        dest='lp_service_root',
+        const='staging',
+        default='production',
+        help='Use LP staging server to test',
+    )
+    lp_grp.add_argument(
+        '--credentials-file', '-c',
+        dest='lp_creds_file',
+        default=os.environ.get('LP_CREDS_FILE'),
+        help=('plain-text credentials file, '
+              'defaults to value of $LP_CREDS_FILE'),
+    )
     parser.add_argument('bugs', type=int, nargs='+',
                         help='Bugs to add comment to')
     args = parser.parse_args()
 
     # Connect to Launchpad
     print("Connecting to Launchpad...")
-    launchpad = launchpadutils.login(args)
+    launchpad = launchpadlib.launchpad.Launchpad.login_with(
+        application_name='openstack-releasing',
+        service_root=args.lp_service_root,
+        credentials_file=args.lp_creds_file,
+    )
 
     # Add comment
     for bugid in args.bugs:
@@ -52,3 +72,7 @@ def main():
             print(" TIMEOUT during save !")
         except Exception as e:
             print(" ERROR during save ! (%s)" % e)
+
+
+if __name__ == '__main__':
+    main()

release.sh

@@ -104,7 +104,7 @@ BUGS=$(git log $PREVIOUS..$VERSION | grep "Closes-Bug:" | egrep -o "[0-9]+")
 if [[ -z "$BUGS" ]]; then
     echo "No bugs found $PREVIOUS .. $VERSION"
 else
-    add-comment \
+    $TOOLSDIR/launchpad_add_comment.py \
         --subject="Fix included in $REPO $VERSION" \
         --content="This issue was fixed in the $REPO $VERSION $RELEASETYPE." \
         $BUGS

setup.cfg

@@ -33,5 +33,4 @@ console_scripts =
     milestone-close = releasetools.cmds.milestone_close:main
     milestones-create = releasetools.cmds.milestones_create:main
     launchpad-login = releasetools.cmds.launchpad_login:main
-    add-comment = releasetools.cmds.add_comment:main
     send-mail = releasetools.cmds.mail:main