Merge pull request #1 from bignall/master

Fixes from recent run
Use unzip as Vagrant is failing on unarchive for unknown reasons
Override existing files when unzipping
libselinux-python is required for selinux module
ansible_fqdn is required for vagrant to work
Ansible beyond 1.7 no longer waits for background tasks. Need -waitforcompletion
setenforce errors if selinux is already disabled
Revert "ansible_fqdn is required for vagrant to work"

This reverts commit 624252907e956341a28cdecd3e8e23be99f7ff11.
Don't fail when SELinux is already disabled
Don't fail when Oracle has been successfully installed