message: Move git revision to environment variable, remove docs, reference runbook
  Closes:
  Approved by: sausagee
diff: @@ -564,10 +564,8 @@ jobs:
  - run:
  name: Set Premainnet Clustetest Environment
  command: |
  - # git revision in premainnet can be found on this site https://fburl.com/cynwp2sv:
  - echo 'export GIT_REV_PREMIAN=163e20a' >> $BASH_ENV
  - # ip address to connect to can be found here (login required)
  - # https://docs.google.com/spreadsheets/d/1_6FUtGU1zdNcpl8-rRHgTH4dhrxGMdmfPfiC1KQHKaI?usp=sharing
  + # Please see the runbook to determine when to update these values: https://fb.quip.com/FnSVAppvJaT9
  + echo Premainnet git revision $PREMAINNET_GIT_REVISION
  echo 'export NODES=a11d2e31854e811eaa1f702474484dd1-21dcb00bef9f6cc0.elb.us-west-2.amazonaws.com:80,\
  a1981c0ab68b011eab1bb02f729e0dd7-3c9f20567ceb2efd.elb.us-west-2.amazonaws.com:80,\
  a569b48655cbc40d092379f55e630966-e1f284c7eb8add73.elb.eu-west-1.amazonaws.com:80,\
  @@ -584,7 +582,7 @@ jobs:
  - checkout
  - run:
  name: Get premain git revision
  - command: git checkout $GIT_REV_PREMIAN
  + command: git checkout $PREMAINNET_GIT_REVISION
  - rust_setup
  - print_versions
  - env_setup
  @@ -600,10 +598,6 @@ jobs:
  - run:
  name: Generate premaintnet config key
  command: |
  - # premainnet seed found here (login required)
  - # https://github.com/libra/partners/blob/master/terraform/validator/package.sh#L13
  - # premainnet number of nodes found here (login required)
  - # https://github.com/libra/partners/blob/master/helm/libra-validator/values.yaml#L2
  cargo run -p config-builder -- faucet \
  --output-dir "/tmp/config" \
  --validators-in-genesis $PREMAINNET_NUM_VAL \
  