Migrate keychain directories to /data/misc/user/0

With new CA certificates being stored in /data/misc/user/<userid>/
existing ones need to be moved into the same place.

After this update only the owner user will have custom trusted CAs; all
other users will revert to the default set.

Change-Id: I14a4cd6048685902ad5dd3b53494b03fadc41c04
Don't always add profile-file option to dex2oat

Add profile-file option to dex2oat only if the profiler is active and
the file exists.

Bug: 12877748
Bug: 15275634
Change-Id: Icef76514c912c88311ed108f2be7a6329131f741
Merge "Don't always add profile-file option to dex2oat"
Merge "Migrate keychain directories to /data/misc/user/0"
Merge branch 'master' of https://android.googlesource.com/platform/frameworks/native into kk-aosp-master