lib/codereview: allow addca CLs without LGTM

LGTM=gri
R=golang-codereviews, gri
CC=golang-codereviews
https://golang.org/cl/61610043

lib/codereview/codereview.py

@@ -1935,7 +1935,7 @@ def submit(ui, repo, *pats, **opts):
 
 	about = ""
 
-	if not cl.lgtm and not opts.get('tbr'):
+	if not cl.lgtm and not opts.get('tbr') and not isAddca(cl):
 		raise hg_util.Abort("this CL has not been LGTM'ed")
 	if cl.lgtm:
 		about += "LGTM=" + JoinComma([CutDomain(who) for (who, line, approval) in cl.lgtm if approval]) + "\n"
@@ -2050,6 +2050,11 @@ def submit(ui, repo, *pats, **opts):
 			return err
 	return 0
 
+def isAddca(cl):
+	rev = cl.reviewer
+	isGobot = 'gobot' in rev or 'gobot@swtch.com' in rev or 'gobot@golang.org' in rev
+	return cl.desc.startswith('A+C:') and 'Generated by addca.' in cl.desc and isGobot
+
 #######################################################################
 # hg sync