Collect stack traces from vold in bugreports

Test: adb bugreport
Test: verified vold stack traces are present in bugreport
Bug: 132344997
Change-Id: I28b5b4cb3f45e3090237fe9767f9c3b704e6c43f
Merged-In: I28b5b4cb3f45e3090237fe9767f9c3b704e6c43f
(cherry picked from commit a8b9c4b8506873bb709e67afc7bf127c577d67d9)
1 file changed