Remove unused trunk and asan linux packages

Now that we're planning on building the linux packages on the CQ, it's
best to have only 6 packages built instead of 10.  This CL removes the
"trunk" and "asan" packages, which are currently unused.  Code search
shows no results for "linux:trunk", "linux:asan", "trunk*deb",
"asan*deb", "trunk*rpm", or "asan*rpm".

BUG=758654
[email protected]

Change-Id: Ibc620f766b6aae0f6b62872df79e949a2221d155
Reviewed-on: https://chromium-review.googlesource.com/646432
Commit-Queue: Thomas Anderson <[email protected]>
Reviewed-by: Lei Zhang <[email protected]>
Reviewed-by: Alexander Potapenko <[email protected]>
Cr-Commit-Position: refs/heads/master@{#499744}
3 files changed