The builder supports all the standard builder set* methods as well as
setting a parent builder to use when values are not set (recursively).
This allows us to have a level of inheretence in configurations without
complicating the lookup and trust checking logic by doing inheretence
when building the configs.
Change-Id: I054af83451e52761227479eadf9cb9803437505f
Initial implementation of a unified application wide static
network security configuration.
This currently encompases:
* Trust decisions such as what trust anchors to use as well as static
certificate pinning.
* Policy on what to do with cleartext traffic.
In order to prevent issues due to interplay of various components in an
application and their potentially different security requirements
configuration can be specified at a per-domain granularity in addition
to application wide defaults.
This change contains the internal data structures and trust management
code, hooking these up in application startup will come in a future
commit.
Change-Id: I53ce5ba510a4221d58839e61713262a8f4c6699c
