tree 2f681cd6a9a5c0234a9a86dbbc80881c9ab8fe50
parent 588b770063077aa8dcee35fc44b2676702cf3457
author Mark Salyzyn <salyzyn@google.com> 1467908691 -0700
committer Mark Salyzyn <salyzyn@google.com> 1468001166 -0700

logcatd: trampoline persist.logd.logpersistd to logd.logpersistd

Best practices so that device can set logd.logpersistd properties.
Values can be overriden with trampolines for persist.logd.logpersistd
values except as designed for empty content to keep out of the way.

This allows us to set logd.logpersistd* for a non-persistent collection
that does not survive a reboot, and to use persist.logd.logpersistd*
for persistent collection that does survive a reboot.

Added logd.logpersistd.enable to gate when logpersist service can be
run allowing the properties to be adjusted safely prior to this state
as is the case for device property.

NB: /init will complain when trying to trampoline an empty property,
    this is acceptable for functionality, but may be considered
    annoying from the logging perspective.

Bug: 28936216
Bug: 29831823
Change-Id: I97317e8eedfae4daa8e3ef39e64e7c5c23d8b573