Fix test scripts to account for new linker behavior

Remove /system/lib from the java.library.path to
avoid loading system libraries in classloader-namespace
by dependencies originated from libarttestd.so

Add additional libraries used by libarttestd.so to
the list of public libraries.

Bug: http://b/26833548
Test: m -j32 test-art-target
Change-Id: I8cfb1b1bec17ca32b2c691597a97b4e9d1667a2f