init.d/vz-redhat: assorted small cleanups

- use local variables where possible
- consolidate initialization in one place
- load/unload simfs module
- bail out earlier if vzctl not found
- use sysctl -q instead of hiding its output
- use sysctl instead of echo
- rename a few functions
- add and use stop_net

[kir@: splitting bigger patch, changelog, load simfs]

http://bugzilla.openvz.org/501
1 file changed