logd: add logd.auditd property

- permit us a mechanism to disable auditd
- standardize property boolean

Bug: 14275676
Change-Id: I76f245c6aee511ed44274159e0ea55915b484dda
Merge "logd: add logd.auditd property"
Add prefx to netlink failure and dispatchCommand overflow logs.

Prefix ensures proper user-consent filter.

(cherry picked from commit 564244cd3809aee58c7e18114970bb88bce9e9e9)

Bug:5848002
Change-Id: Iee7287773f0af52c225a821ee0e9d643c83cc060
Merge "Add prefx to netlink failure and dispatchCommand overflow logs."
auto-merger: merge in from aosp/master