Servicemon

This is more of a todo-list than a blueprint.

• make .descr parser a little more robust (it doesn't handle empty arguments (like 'args=')
• fix version checking in DNS checker
• write a new checkservice?
• update copyright notices and encodings for library

• use library to fix LP#545029
• add a library function that checks if a command exists and is executable (and returns the full path to the command.)
• remove getRequiredArguments() from all checkers (it is never called, and just confuses anyone who works on the code)
• replace timeoutsocket.py with builtin standard Python socket methods settimeout() and makefile('r+')
• remove core.py (which is no longer used)
• remove duplicate code from http/https checkers (done)
• update copyright notices in checkers
• add new DHCP checker

https://heimdal.uit.no/hg/olemb/servicemon-spring-cleaning/ (branch: servicemon-spring-cleaning)