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And change mb config for "Network Service Linux" to release_bot
It does not seems right for a CI builder to use a trybot config

Bug: 1099088
Change-Id: Iab1c9cb742a3ccd5334f2927b5d376064069fa3f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2267843Reviewed-by: Stephen Martinis <martiniss@chromium.org>
Commit-Queue: Haiyang Pan <hypan@google.com>
Cr-Commit-Position: refs/heads/master@{#782686}