Plumb tombstoned connections through PALette.

This removes APEX internal dependencies on libtombstoned_client and
libcutils.

Test: art/build/apex/runtests.sh
Test: adb shell killall -QUIT system_server; check tombstoned report in /data/anr
Test: Make /data nearly full; adb shell killall -QUIT system_server; check
  that the report in /data/anr has zero length and that the stack traces are
  sent to logcat instead
Bug: 130025619

(cherry picked from commit 2e2c45efd6233b831e0ea5f763c0c27c1494e30f)

Change-Id: If9aab89a05d3579f85fe4679ada599e0540cda8a