Significant code rewrite. It still needs more testing. Let's say it's in alpha state.

New features:
- Node state checking
- Active/Passive node detecting
- Dry run
- Active node VIP and NAT configuration fixing
...

Usage: ./myHA.pl -c config.pl [-s no_ssh|-m no_mysql] [-a active_node -p passive_node] [-f] [-h]
        -c: Configuration file.
        -s: No ssh check on the passive node.
        -m: No mysql check on the passive node.
        -a: Active node.
        -p: Passive node.
        -f: Force/Fix.
        -x: Flip-Flop.
        -h: Show help.