Apexd: Enforce selinux in most of apexservice_test

Add local selinux-disable code to the tests that still require it.

Also change the comment on the RootTargetPreparer. The test is
intentionally low-level and thus needs root rights to prepare files
that are normally prepared by a higher level.

Bug: 112669193
Test: atest apexservice_test
Change-Id: Ib9bcaddba3b54352f07e5a6b477329918fec0226
2 files changed
tree: f12b3073107cea7392f1c42caf060d777ea0c1e5
  1. apexd/
  2. apexer/
  3. proto/
  4. tests/
  5. OWNERS
  6. PREUPLOAD.cfg