[TESTBUG] Rewrite remaining SVC HotSpot shell tests in Java

I ran updated inventory of shell tests, and there are only 2 serviceability shell tests remaining in test/hotspot sub-tree:
        serviceability/7170638/SDTProbesGNULinuxTest.sh
        vmTestbase/nsk/jvmti/Allocate/alloc001/TestDescription.java

Note:
  - the alloc001/TestDescription.java, although it has .java extension, it does use shell code: "* @run shell alloc001.sh"
  - this list is only for svc tests residing under hotspot sub-tree, and does not include j.l.instrument, sun/tools, or management
    Separate issues are filed for those categories