Add docker configurations used by the buildbots.

These are the scripts I use to create the docker images for
the build bots and run them.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@347244 91177308-0d34-0410-b5e6-96231b3b80d8

utils/docker/scripts/run_buildbot.sh

@@ -0,0 +1,55 @@
+#!/usr/bin/env bash
+set -x
+
+BOT_DIR=/b
+BOT_NAME=$1
+BOT_PASS=$2
+
+mkdir -p $BOT_DIR
+
+#curl "https://repo.stackdriver.com/stack-install.sh" | bash -s -- --write-gcm
+
+apt-get update -y
+apt-get upgrade -y
+
+systemctl set-property buildslave.service TasksMax=100000
+
+buildslave stop $BOT_DIR
+
+chown buildbot:buildbot $BOT_DIR
+
+echo "Connecting as $BOT_NAME"
+buildslave create-slave --allow-shutdown=signal $BOT_DIR lab.llvm.org:9990 $BOT_NAME $BOT_PASS
+
+echo "Eric Fiselier <ericwf@google.com>" > $BOT_DIR/info/admin
+
+{
+  uname -a | head -n1
+  cmake --version | head -n1
+  g++ --version | head -n1
+  ld --version | head -n1
+  date
+  lscpu
+} > $BOT_DIR/info/host
+
+echo "SLAVE_RUNNER=/usr/bin/buildslave
+SLAVE_ENABLED[1]=\"1\"
+SLAVE_NAME[1]=\"buildslave1\"
+SLAVE_USER[1]=\"buildbot\"
+SLAVE_BASEDIR[1]=\"$BOT_DIR\"
+SLAVE_OPTIONS[1]=\"\"
+SLAVE_PREFIXCMD[1]=\"\"" > /etc/default/buildslave
+
+chown -R buildbot:buildbot $BOT_DIR
+systemctl daemon-reload
+service buildslave restart
+
+sleep 30
+cat $BOT_DIR/twistd.log
+grep "slave is ready" $BOT_DIR/twistd.log || shutdown now
+
+# GCE can restart instance after 24h in the middle of the build.
+# Gracefully restart before that happen.
+sleep 72000
+while pkill -SIGHUP buildslave; do sleep 5; done;
+shutdown now