Revert "Support for epel*-playground branch requests"
    
    Per recent changes discussed in the EPEL SC meetings, `epel*-playground`
    branches should no longer be created automatically when a corresponding
    `epel*` branch is requested.
    
    Reverting this commit makes `epel*` branches behave like normal branches
    and no longer disallow `epel*-playground` branches from being manually
    requested if needed.
    
    This reverts commit eabb5ae7dd0495f67b73d76137df78b84e2792ec.
    
    Fixes: #414
    
    Signed-off-by: Michel Alexandre Salim <michel@michel-slm.name>