Merge branch 'stable-3.0'

* stable-3.0:
  Remove unused JSON_PREFIX constant
  Fix adding additional ssh-keys via UI
  Allow additional SSH-key formats
  Switch required bazel version to 0.29.1
  Upgrade bazlets to latest stable-3.0
  Upgrade bazlets to latest stable-2.16
  Upgrade bazlets to latest stable-2.15
  Bump required bazel version to 1.0.0rc2
  Upgrade bazlets to latest stable-2.14
  Remove unwanted char from user details screen
  Fix visibility of service users for non-admin owners
  Fix setting a new owner from UI
  Add validation for SSH-key before account creation
  Apply GJF-1.7 codestyle
  Upgrade bazlets to latest stable-2.15
  Upgrade bazlets to latest stable-2.14
  Add PolyGerrit UI for creating a service user
  Upgrade bazlets to latest stable-3.0 to build with 3.0.2 API
  Modify the detail-screen to allow editing the service user
  Upgrade bazlets to latest stable-2.16 to build with 2.16.11.1 API
  Upgrade bazlets to latest stable-2.15 to build with 2.15.16 API
  Add PolyGerrit UI for showing service user details
  Add PolyGerrit UI to list service users
  Add eslint config
  Upgrade bazlets to latest stable-2.15 to build with 2.15.15 API

Change-Id: I6fb19f26391e9a779dc39b59b92b1dd9d0855307