Fix python style issues reported by flake8
Additionally some python2-only "print" statements are now compatiblewith python3.
Plugin lighttpd_: fix code style issues reported by flake8
Category Tree: Reduce number of categoriesceph, samba, zfs into "fs" apache into "webserver" lighttpd into "webserver" ..
Allow also digest auth mechanism.
Currently only basic auth was supported. I added the ability of doingdigest auth (via 'env.auth_type').
Also, I fixed a bug where 'env.status_url' was ignored.
Update lighttpd_
fix typo
Added new plugin to monitor lighttpd web server