Fix & Improve Test-Building and -Running Scripts

(This is a merge of wvgerrit/24922)

This contains several fixes and improvements to the
build_and_run_all_unit_tests.sh and run_all_unit_tests.sh scripts:

* All tests are now identified as vendor binaries and thus are stored in
  the /vendor/bin/ directory instead of /system/bin/. Previously, some
  tests had moved to /vendor/bin/ but the scripts had not been updated,
  causing these tests to fail to run.
* The -j parameter can now be passed to build_and_run_all_unit_tests.sh,
  for those who want to speed up their build by using multiple cores.
* The 64-bit library directories are now added to the library search
  path, in anticipation of devices with 64-bit DRM Plugins.
* Checking for Verity protection is now done in
  build_and_run_all_unit_tests.sh (which is the script that actually
  modifies the file system) instead of just in run_all_unit_tests.sh.
* The library search path is no longer set unnecessarily for
  libwvdrmengine_hidl_test.
* The Treble-only tests and non-Treble-only tests now only run on
  devices that meet their respective criteria.

Bug: 36071236
Test: Ran build_and_run_all_unit_tests.sh
Change-Id: Iea236880c4445858111c801dfa278a528bca0f6c

libwvdrmengine/mediadrm/test/Android.mk

@@ -46,6 +46,10 @@ LOCAL_MODULE := libwvdrmdrmplugin_test
 
 LOCAL_MODULE_TAGS := tests
 
+LOCAL_MODULE_OWNER := widevine
+
+LOCAL_PROPRIETARY_MODULE := true
+
 LOCAL_MODULE_TARGET_ARCH := arm x86 mips
 
 include $(BUILD_EXECUTABLE)
@@ -108,6 +112,10 @@ LOCAL_MODULE := libwvdrmdrmplugin_hidl_test
 
 LOCAL_MODULE_TAGS := tests
 
+LOCAL_MODULE_OWNER := widevine
+
+LOCAL_PROPRIETARY_MODULE := true
+
 LOCAL_MODULE_TARGET_ARCH := arm x86 mips
 
 include $(BUILD_EXECUTABLE)