[+BUGFIX] Fixed incorrect PDO_Oci platform recognition

When instanciating the PDO driver with pdo_oci, it will return "Oci" as
platform name which is not correct. The correct Platform name is
"Oracle"
Merge PR #3988 to master
Merge branch 'hotfix/pdo-oci-platform' of git://github.com/tux-rampage/zf2 into tux-rampage-hotfix/pdo-oci-platform
Forward Port #3957
Merge branch 'tux-rampage-hotfix/pdo-oci-platform' into develop