https://bugs.webkit.org/show_bug.cgi?id=101091

Reviewed by Adam Barth.

The bug was caused by LayoutTestResultsReader passing a relative file path to the archive zip
to workspace.archive_zip. Because archive_zip uses the results directory as the working directory,
this relative file path resoled to a file inside a non-existent directory for "zip".

Fixed the bug by resolving both test results directory and zip archive paths in
LayoutTestResultsReader.archive.

Also made workspace.create_zip print the source_path so that we may debug these issues more easily
in the future.

* Scripts/webkitpy/common/system/filesystem_mock.py:
(MockFileSystem.splitext): Don't assume the entire file path is a file extension when there is no ".".

* Scripts/webkitpy/common/system/workspace.py:
(Workspace.create_zip): Log the source path when "zip" failed.

* Scripts/webkitpy/common/system/workspace_mock.py:
(MockWorkspace.create_zip): Record zip_path and source_path for testing.

* Scripts/webkitpy/common/system/workspace_unittest.py:
(WorkspaceTest.test_create_zip_exception): Test that.

* Scripts/webkitpy/tool/bot/layouttestresultsreader.py:
(LayoutTestResultsReader.archive): Resolve paths before passing them to workspace.create_zip.
This is the actual bug fix.

* Scripts/webkitpy/tool/bot/layouttestresultsreader_unittest.py:
(test_archive_last_layout_test_results_with_relative_path): Added a test case.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@146443 268f45cc-cd09-0410-ab3c-d52691b4dbfc