Cleanup in centos6.sh. Fix vm.swapiness to 1 instead of 0. Add ner useful packages.
Cleanup in centos6.sh. Fix vm.swapiness to 1 instead of 0. Add ner useful packages.

karljohns0n/centos-postinstaller,karljohns0n/centos-postinstaller,karljohns0n/centos-postinstaller