Add build id as part of bugreport name.

Rather than bugreport-DATE, the base bugreport name will be
bugreport-BUILD_ID-DATE, which will make it easier to identify
build associated with the report.

Since this change modifies the bugreport format, its version has been
increased to 'v1-dev4' and it is not enabled by default.

BUG: 27618668
Change-Id: I4492f8234520ee27c2eb0e4b8313fc937c498fea