Improve test utilities

Improve test utilities

* lisp/cedet/semantic/analyze.el:
 (semantic-analyze-find-tag-sequence-default): If first entry in
 sequence is the only one, apply tagclass
 filter. (semantic-analyze-princ-sequence): Show slot even if empty.
* tests/cedet/semantic/ia-utest.el: (semantic-ia-utest-file-list): Add
 testvarnames.java.
* tests/cedet/semantic/test/manual/cedet/Project.ede:
 ("semantic/tests"): Add testvarnames.java
* tests/cedet/semantic/test/manual/cedet/testvarnames.java: New test
 file