Fix incompatibility with gerrit 2.8

This change updates the gerrit hook scripts to be compatible with gerrit version 2.8

Closes-Bug: #1273947
Partial-Bug: #1082781

Change-Id: I529bb9fbded16ccafb020b4edc9eb2d5e641cbc7
diff --git a/jeepyb/cmd/notify_impact.py b/jeepyb/cmd/notify_impact.py
index 7038c8f..a689f67 100644
--- a/jeepyb/cmd/notify_impact.py
+++ b/jeepyb/cmd/notify_impact.py
@@ -194,6 +194,7 @@
     parser.add_argument('--project', default=None)
     parser.add_argument('--branch', default=None)
     parser.add_argument('--commit', default=None)
+    parser.add_argument('--topic', default=None)
 
     # change-merged
     parser.add_argument('--submitter', default=None)
@@ -201,6 +202,7 @@
     # patchset-created
     parser.add_argument('--uploader', default=None)
     parser.add_argument('--patchset', default=None)
+    parser.add_argument('--is-draft', default=None)
 
     # Not passed by gerrit:
     parser.add_argument('--impact', default=None)
diff --git a/jeepyb/cmd/update_blueprint.py b/jeepyb/cmd/update_blueprint.py
index 3e3604b..58cc390 100644
--- a/jeepyb/cmd/update_blueprint.py
+++ b/jeepyb/cmd/update_blueprint.py
@@ -130,11 +130,13 @@
     parser.add_argument('--project', default=None)
     parser.add_argument('--branch', default=None)
     parser.add_argument('--commit', default=None)
+    parser.add_argument('--topic', default=None)
     #change-merged
     parser.add_argument('--submitter', default=None)
     # patchset-created
     parser.add_argument('--uploader', default=None)
     parser.add_argument('--patchset', default=None)
+    parser.add_argument('--is-draft', default=None)
 
     args = parser.parse_args()
 
diff --git a/jeepyb/cmd/welcome_message.py b/jeepyb/cmd/welcome_message.py
index 03278cc..a949cf2 100644
--- a/jeepyb/cmd/welcome_message.py
+++ b/jeepyb/cmd/welcome_message.py
@@ -124,11 +124,13 @@
     parser.add_argument('--project', default=None)
     parser.add_argument('--branch', default=None)
     parser.add_argument('--commit', default=None)
+    parser.add_argument('--topic', default=None)
     # change-merged
     parser.add_argument('--submitter', default=None)
     # patchset-created
     parser.add_argument('--uploader', default=None)
     parser.add_argument('--patchset', default=None)
+    parser.add_argument('--is-draft', default=None)
     # for Welcome Message
     parser.add_argument('user', help='The gerrit admin user')
     parser.add_argument('ssh_key', help='The gerrit admin SSH key file')