Added usage of authinfo file

This change will make sure that no passwords and other credential
information is visible in the process information while installing via
winexe.
Removal of temporary files

Make sure that authinfo is always deleted, remove tmpdir on succesfull
installation.
Be a little more careful what to delete.
Added usage of authinfo file

This change will make sure that no passwords and other credential
information is visible in the process information while installing via
winexe.
Merge branch 'authinfo' of github.com:opinkerfi/okconfig into authinfo
Renamed logfile and notify of location

Renamed logfile to install.log
Error messages now reference the install log when they fail.
Added --test to install_nsclient

Skips actual installation and just does a connection test.
Removed unnessesary overwrite of env variables

Now the following variables can be set through environment

	DOMAIN
	DOMAIN_USER
	DOMAIN_PASSWORD
Older version of mktemp do not support suffix
Check early for the existance of install directory
Full patch from earlier
Migrated to older syntax for redirection
Moved install successful outside loop
More info for error on missing nsclient
Added more log handling
Logging improved
Added okconfig log directory
Persistant logfile and support for authfile

Logging to /var/log/okconfig and logrotation
Support for -A <authfile>
Removed tempdir and use mktemp only for authfiles
Merge pull request #46 from opinkerfi/authinfo

Authinfo and logging improvements, mostly to remove exposure of password in command line.