changed selinux disable to permissive
changed selinux disable to permissive

Selinux disabling requires reboot, changing to permissive
mode does not. Permissive mode logs all potential actions, thus
allowing one to build a working selinux profile from the logs, giving
potential for a seamless move to enforcing mode (provided one doesn't
build a profile from an owned machine...). Added this task to only
run on RedHat machines, though selinux *can* and should be installed
on Debian as well, not putting time on this till it's a priority.

gouravshenoy/airavata,apache/airavata,apache/airavata,gouravshenoy/airavata,apache/airavata,gouravshenoy/airavata,gouravshenoy/airavata,gouravshenoy/airavata,apache/airavata,apache/airavata,apache/airavata,gouravshenoy/airavata,gouravshenoy/airavata,apache/airavata,apache/airavata