Fix test failures for UploadAndDownloadPackageWith*.

The failed tests are due to changes with the new search service. Packages needs to wait 2min or so for them to appear in search index and the Odata feed after being uploaded.
A temp. workaround is to use thread.sleep(). Will need to investigate a more permanent solution.
minor test fixes. More logging that helps with debugging.
Fix Fluent tests, which include:
1. Disable of sorting search results based on gallery changes
2. Commenting out the search syntax tests by title: and :description
3. Ignore the LicenseUI test as it requires a long process for the LicenseUI to show up for the test packages.
4. Add a new LicenseUI test using existing packages of jQuery that already have the license tab available
5. Add a CheckForPackageExistence variable to work around the issue that the httpwebrequest will time out after a few tries. As the packages with fixed ID and version all exist now, this is okay.
Merge branch 'master' of https://github.com/NuGet/NuGetGallery into danliu/testfix
Merge pull request #2049 from NuGet/danliu/testfix

Danliu/testfix