gerrit: add cla

Change-Id: Ie276d6d934ece80f298d6d0a4e1e8526e551e35b
Reviewed-on: https://review.gerrithub.io/c/storj/storj/+/458679
Tested-by: <robot@storj.io>
Reviewed-by: Jeff Wendling <jeff@storj.io>

Jenkinsfile.gerrit

@@ -10,7 +10,10 @@ pipeline {
     }
     stages {
         stage('Start') {
-          steps { gerritReview message: 'Building' }
+          steps {
+            gerritReview message: 'Building'
+            sh 'python ./scripts/gerrit-cla.py'
+          }
         }
 
         stage('Build') {

scripts/gerrit-cla.py

@@ -0,0 +1,72 @@
+#!/usr/bin/env python2
+
+import os, subprocess
+
+email = subprocess.check_output(["git", "log", "--format=%ae", "-1"]).strip()
+
+signed_emails = set("""
+34487396+aligeti@users.noreply.github.com
+38050125+benjaminsirb@users.noreply.github.com
+3bl3gamer@gmail.com
+40370773+brandonstorj@users.noreply.github.com
+46756926+VitaliiShpital@users.noreply.github.com
+artemenkobogdan@gmail.com
+barlock@users.noreply.github.com
+bill3000@hotmail.com
+billt@storj.io
+brimstone@the.narro.ws
+bryanchriswhite@gmail.com
+butko.yehor@gmail.com
+camayer92@gmail.com
+coyle@users.noreply.github.com
+crawter@hotmail.com
+dennis@coyle.io
+dylan@storj.io
+egonelbre@gmail.com
+ethan@storj.io
+Fadila82@users.noreply.github.com
+faris@storj.io
+fhuskovic92@gmail.com
+hello@jtolio.com
+ifcdev@gmail.com
+iglesiasbrandon@users.noreply.github.com
+ivan@fraixed.es
+jeff@storj.io
+jennifer@storj.io
+jens.heimbuerge@googlemail.com
+Jessica.greben1+github@gmail.com
+jhagans3@gmail.com
+kaloyan-raev@users.noreply.github.com
+kaloyan@storj.io
+kevin@storj.io
+leitnersalex@gmail.com
+leterip@gmail.com
+mail@stefan-benten.de
+marc.schubert@gmail.com
+meijesibbel@hotmail.com
+me@super3.org
+michal@storj.io
+mobyvb@gmail.com
+mrobinson@storj.io
+nat@storj.io
+navillasa@gmail.com
+nfarah86@gmail.com
+nickolai.yurchenko@gmail.com
+phutchins@users.noreply.github.com
+ReneSmeekes@users.noreply.github.com
+richard.littauer@gmail.com
+sander@grids.be
+simon@nureality.ca
+thepaul@users.noreply.github.com
+tim@storj.io
+yaroslav@storj.io
+yar.vorobiov@gmail.com
+yingrong.zhao@gmail.com
+""".strip().split("\n"))
+
+if email not in signed_emails:
+  print "The email address '%s' is not in scripts/gerrit-cla.py as a CLA signer" % email
+  print "Please sign https://docs.google.com/forms/d/e/1FAIpQLSdVzD5W8rx-J_jLaPuG31nbOzS8yhNIIu4yHvzonji6NeZ4ig/viewform"
+  os.exit(1)
+
+print "CLA signed"