Create test.flag
Rename test.flag to config/test.flag

moved the file to the `config` directory to ensure it ends up on the SD card.
Rename test.flag to testflag.txt

Rename the file to promote users to read the content.
Incorporate a testing semaphore

Changes to add the functionality required to make the `testflag.txt`
work. This can now be used to disable certain services if the
`testflag.txt` file exists in order to prevent interference with
already running servers.
Merge pull request #34 from Mausy5043/flagtest

Add semaphore for testing live servers