minijail: Support multiple range uid/gid mappings.

Now minijail accept multiple ranges of contiguous uid/gid mappings that
is seperated by commas. The commas are replaced by newlines before
writing to map files.

BUG=chromium:517387
TEST=security_Minijail0 pass

Change-Id: I27d45480010b38e71b80837cc2299f180d77c4a1
Reviewed-on: https://chromium-review.googlesource.com/296270
Commit-Ready: Yu-hsi Chiang <yuhsi@google.com>
Tested-by: Yu-hsi Chiang <yuhsi@google.com>
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
2 files changed