logd: clientHasLogCredentials false negatives

(cherry pick from commit 86eb38f3)

Vote three times in /proc/pid/status to look for AID_LOG group

If not, we may default to the callers UID, and the net result is
to perform the task related to that UID. For adb logcat and
shell logcat, the UID is AID_SHELL which typically has no logs,
leaving no net action taken.

Bug: 23711431
Change-Id: I2b5900a2d37173bd995eb308ee9ecafa20602b62