GCEAUWorker: reserve static external IP address for each instance

TEST=platform_PowerButton test (will come in a separate CL)
BUG=b:25394852
CQ-DEPEND=CL:316900
Change-Id: Iae6b3a958585519822c1be7e5ec339b362d214ba
Reviewed-on: https://chromium-review.googlesource.com/316916
Commit-Ready: Andrey Ulanov <andreyu@google.com>
Tested-by: Andrey Ulanov <andreyu@google.com>
Reviewed-by: Daniel Wang <wonderfly@google.com>
1 file changed