Revert "Merge pull request #64 from rhafer/postinstall-cleanup"

This reverts commit faa948fb575b3fdd8e3db1654778f70837e794f5, reversing
changes made to 0a311738be28efcb6b159805861eb42af14bd7da.
Revert "Merge pull request #62 from vuntz/db-ha"

This reverts commit 0a311738be28efcb6b159805861eb42af14bd7da, reversing
changes made to 7227cba224e59879332986593ca884e27a28b2f7.
Revert "Merge pull request #54 from vuntz/haproxy"

This reverts commit 7227cba224e59879332986593ca884e27a28b2f7, reversing
changes made to bd46e2e71b5b97a3584aa09dd72b7ec8facf5b51.