Use absolute paths in tests.

Test: /data/nativetest64/installd_cache_test/installd_cache_test
Test: /data/nativetest64/installd_dexopt_test/installd_dexopt_test
Test: /data/nativetest64/installd_otapreopt_test/installd_otapreopt_test
Test: /data/nativetest64/installd_service_test/installd_service_test
Test: /data/nativetest64/installd_utils_test/installd_utils_test
Bug: 73950947
Change-Id: I68c9d5a750d6528aadac40230182602f8222ed5d