pipe2browser: Change vomtestgen and vdl tools flags from underscores to hyphens.
pipe2browser: Change vomtestgen and vdl tools flags from underscores to hyphens.

MultiPart: 5/6

Change-Id: I49d78df0a3a1a14aad7f43c54d1191af156fa090

vanadium/pipe2browser,vanadium/pipe2browser,vanadium/pipe2browser,vanadium/pipe2browser