[autotest] Schedule tests against lumpy-pgo-release builds.

We currently see lumpy-pgo-release builds, and then schedule tests
against lumpy-release.  This CL changes the parsing so that we see
pgo-release as a build config type, and then schedule tests against
lumpy-pgo-release as one would expect.

Note that it took a local modification to base_event.ParseBuildName in
order for a local run of suite_scheduler to work.  This will get fixed
once a standardized fully parseable naming convention is agreed upon.

BUG=chromium-os:39283
TEST=unit
forced event locally and watched lumpy-pgo-release get scheduled

Change-Id: Ic9dba31e58d342b593a7d84f605bddfb77a81d9c
Reviewed-on: https://gerrit.chromium.org/gerrit/44366
Tested-by: Alex Miller <milleral@chromium.org>
Reviewed-by: Simran Basi <sbasi@chromium.org>
Commit-Queue: Alex Miller <milleral@chromium.org>
3 files changed