Add ability to set caching rules for the testing repositories

[Korulag]

One of the test system users' request is to add the ability to state that some folder in test repository can be applied to several packages without creating a ton of symlinks. For example, you have folder "p_rh-python" which can be used for testing rh-python36, rh-python37, rh-python38, etc. AC:

• Users are able to write a configuration file in YAML format inside the test repository which will be providing folders and regular expressions to match packages names, for example: p_rh-python: rh-python\d+ p_git: \w+git\d+
• [Optional] Users are able to add matching rules via test repository configuration UI.