Tools: Remove obsolete webserver class

In eqiad there are no webservers, and thus toollabs::webserver is now
obsolete.

Also, for toollabs::proxy there are no longer servers to fall back on,
so remove their list in order to let the proxy handle non-existing
URLs itself.

Change-Id: I994d8671546debf1553e9cf93021abc9776b3d5d
Merge "Tools: Remove obsolete webserver class" into production