RFR: 8267796: vmTestbase/nsk/jvmti/scenarios/hotswap/HS201/hs201t002/TestDescription.java fails with NoClassDefFoundError

[Alex Menkov]

The fix adds workaround in hs201t001a class like we have in hs201t001 test to avoid class loading while the test do single stepping/pop frame.
Also fixed a number of issues in the test.

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Commit messages:
 - trailing whitespace
 - JDK-8267796

Changes: https://git.openjdk.java.net/jdk/pull/7607/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7607&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8267796
  Stats: 125 lines in 4 files changed: 55 ins; 37 del; 33 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7607.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7607/head:pull/7607

PR: https://git.openjdk.java.net/jdk/pull/7607