commit ddb3324051ddfcb05fae4c8a05321cb4d33d1878
author Ross Light <light@google.com> Thu Sep 28 08:14:01 2017 -0700
committer Ross Light <light@google.com> Fri Sep 29 22:44:37 2017 +0000
tree 833c105d76216b924a4143202cb6ba1eebe0fbaf
parent 9ab519192d28b7a44914a2e82e17ccb49c5e3574

gddo-server: collect GCE metadata configuration in Viper

Remove the gaAccount global variable in favor of reading from
configuration.

Minor behavior changes:
- The GA_ACCOUNT environment variable will override the GCE metadata
  ga-account, where before it was not being read on GCE.
- The project ID across the program defaults to the one from GCE
  metadata, overridden by the GCLOUD_PROJECT environment variable or the
  command-line flag.  The GCE logger now uses this project ID instead of
  just considering the GCE metadata.
- The GCE log name can now be set using the gddo_gce_log_name
  environment variable.

Change-Id: I0ed2ae7a5130d63146e9bf2746f22980c8a782b9
Reviewed-on: https://go-review.googlesource.com/67050
Reviewed-by: Tuo Shan <shantuo@google.com>