check that tunnel ip is not in use
fixing checking of overlaping range
update changelog
fixed valdiation when enabling
better check of duplicates tunnelips and ranges
conf complete check for l2tp
fixed management of l2tp daemons with the exceptions of removal
sopeed deleted l2tp daemons
added configuration complete validation to ipsec
up chlog
typo fix
use comments to clarify some methods
Merge pull request #1356 from Zentyal/jag/ipsec-validations

Added validation for IPs in L2TP configuration/Better management of l2tp daemons