Move test summary counts to end; simplify issue detail line

Test summary counts now show at the end, with issue details
above.

Issue details now print "ISSUE_TYPE: test method (relative path)".
Relative paths are relative to the
packages/Python/lldbsuite/test directory.

Sample output:

test/dotest.py --executable `pwd`/build/Debug/lldb --results-formatter lldbsuite.test.basic_results_formatter.BasicResultsFormatter --threads 12
Testing: 415 test suites, 12 threads
415 out of 415 test suites processed - TestLldbGdbServer.py
Test Results
Total Test Methods Run (excluding reruns): 2470
Test Method rerun count: 0

Details:
UNEXPECTED SUCCESS: test_symbol_name_dsym (functionalities/completion/TestCompletion.py)
UNEXPECTED SUCCESS: test_symbol_name_dwarf (functionalities/completion/TestCompletion.py)

===================
Test Result Summary
===================
Success:            1329
Expected Failure:     79
Failure:               0
Error:                 0
Unexpected Success:    2
Skip:               1060

llvm-svn: 254890