[Android][REG] Packaging tool does not work with python 3.0+

1. Move HandleActionUriTest.java, SetDatabaseEnabledTest.java,
SetDomStorageEnabledTest, SetNetworkAvailableTest.java, UserAgentTest.java from
core shell test to core internal shell test.
2. Remove the unnecessary code in ShouldInterceptLoadRequestTest.java by the way.
3. Remove the internal dependency in XWalkViewTestBase.java