Fix the min version for DBAL
Fix the min version for DBAL

Tests are relying on the MasterSlaveConnection added in DBAL 2.2.

swarrot/swarrot,metfan/swarrot,olaurendeau/swarrot,stof/swarrot,lafourchette/swarrot,swarrot/swarrot,metfan/swarrot,olaurendeau/swarrot,odolbeau/swarrot,odolbeau/swarrot,lafourchette/swarrot,MattKetmo/swarrot,MattKetmo/swarrot,stof/swarrot