Merge changes I8b57ef5e,I7545ec8e

* changes:
  Use F_DUPFD_CLOEXEC with SharedFD::Dup.
  Create subprocess file descriptors as cloexec
tree: 9b34cef2b45e1fa5623a5d6c8918d407b67d0e60
  1. common/
  2. guest/
  3. host/
  4. tests/
  5. tools/
  6. Android.bp
  7. Android.mk
  8. OWNERS
  9. TEST_MAPPING