findmissing: Created endpoint for bugfix CL creation

Implemented logic surrounding creating a bugfix CL in gerrit, finding
and attaching relevant reviewers, and assigning the CL a hashtag
'autogenerated' to indicate the patch robot created the CL.

BUG=None
TEST=None

Change-Id: I08d03b3c8cbd5707c73026c4682064ad7d7d7ac3
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/2100291
Commit-Queue: Hirthanan Subenderan <hirthanan@google.com>
Tested-by: Hirthanan Subenderan <hirthanan@google.com>
Reviewed-by: Curtis Malainey <cujomalainey@chromium.org>
Reviewed-by: Guenter Roeck <groeck@chromium.org>
diff --git a/contrib/findmissing/common.py b/contrib/findmissing/common.py
index 938853b..5452b57 100755
--- a/contrib/findmissing/common.py
+++ b/contrib/findmissing/common.py
@@ -23,7 +23,8 @@
 STABLE_REPO = KERNEL_SITE + 'pub/scm/linux/kernel/git/stable/linux-stable'
 
 CHROMIUM_SITE = 'https://chromium.googlesource.com/'
-CHROMEOS_REPO = CHROMIUM_SITE + 'chromiumos/third_party/kernel'
+CHROMEOS_KERNEL_DIR = 'chromiumos/third_party/kernel'
+CHROMEOS_REPO = os.path.join(CHROMIUM_SITE, CHROMEOS_KERNEL_DIR)
 CHROMIUM_REVIEW_BASEURL = 'https://chromium-review.googlesource.com/a'
 
 # Order SUPPORTED_BRANCHES from oldest to newest