Fix Apache PassEnv config files

- SDK: Write PassEnv configuration to the separate file
- Cartridges: Lock all Apache configuration files except the PassEnv file
- Cartridges: Create/truncate the PassEnv file on setup

https://bugzilla.redhat.com/show_bug.cgi?id=969098
Merge pull request #3552 from VojtechVitek/passenv

Merged by openshift-bot