Add exemption for test_framework-apexd and test_service-apexd jars

For testing purpose, we need to add java libraries to bootclasspath and
systemserverclasspath that are not present in PRODUCT_APEX_BOOT_JARS and
PRODUCT_APEX_SYSTEM_SERVER_JARS.

Currently, we can't unconditionally add all the contents to the config
for test APEXs. Until a formal way is introduced, hardcoding the
artifact in the build system like how it's done for
test_framework-sdkextensions.

Bug: 187444679
Test: atest ApexTestCases
Test: atest StagedInstallInternalTest
Change-Id: I1f7b01a57bc9c46163e025de2ab00e671a42b202