Apexd: Factor out opening file+manifest

Use a helper and pair to factor out opening an APEX file and its manifest.

Test: m
Change-Id: Id1476a56df82daf7ff0ca2458621aceba78d1e91
1 file changed
tree: 1bd6e3768d23cf33bb6f8db87325fe30d5090b8a
  1. apexd/
  2. apexer/
  3. testdata/
  4. Android.bp
  5. OWNERS
  6. PREUPLOAD.cfg