Add new context packagemanager_config_prop

To remove bad context names exported[23]_default_prop

Bug: 155844385
Test: m selinux_policy
Change-Id: Ic4bbc8e45d810368a96f6985c2234798e73be82d
Merged-In: Ic4bbc8e45d810368a96f6985c2234798e73be82d
(cherry picked from commit 072b01438e02e9d3cfba04c768e7a440549cc8b1)
7 files changed