Fix error when the benchmark repository is not specified.

Fixes "unbound variable" error in azure-deployment.sh when a custom repository is not defined in the deployment configuration.
Adding Racket Web Server test
Merge pull request #467 from fernandoacorreia/fix-unbound-variable

Fix error when the benchmark repository is not specified
Merge pull request #468 from jeapostrophe/master

Adding Racket Web Server test
Fix reference to moved files

Fixes references to some files that were moved in the toolset directory reorganization.
Export configuration with quotes

Fixes errors due to improper conversions when the variables are used.
Retry commands that involve downloads