obsapisetup wants to do an initial setup everytime

In the appliance, `/etc/my.cnf` contains the entry `datadir` twice. This leads to a wrong `$MYSQL_DATA_DIR`, which let [this conditional](https://github.com/chkpnt/open-build-service/blob/b3b6b1de71b17e0db77760363a74dd8462557673/dist/obsapisetup#L134) fail.