Removed JDBC hash from deploy scripts

- The JDBC hashes from bash_functions and GB and CP's deploy scripts
  have been removed. These were causing issues in RHEL6, which ships
  with an older version of bash that does not yet support the -g
  flag on declare.
  They've been replaced with standard variables.
Removed note about bash version requirement.
Merge pull request #785 from candlepin/crog/rhel6-deploy

Removed JDBC hash from deploy scripts