Support SpyMemcached V2.x

Fix bug.

Upstream log can't output correctly.

Support multi plugin defines targeting the same class. Relate to #402, but more than that. e.g. Enhance a class in the certain version library, but we need multi plugins to do so, like @clevertension ’s #465

Support multi plugin defines targeting the same class. 

Fix bug.

Revert "support  @RequestMapping annotation of spring 3.x"

support  @RequestMapping annotation of spring 3.x

* master:
  Change version for next iteration.
  add more special chars
  fix unit test
  fix Illegal group reference
  Update TraceSegmentServiceClient.java

fix Illegal group reference

Upstream log can't output correctly.

Support multi plugin defines targeting the same class. Relate to #402, but more than that. e.g. Enhance a class in the certain version library, but we need multi plugins to do so, like @clevertension ’s #465

Version change, 3.2.1 to 3.2.2

fixed #469

fix log encode issue and check style failured