-- default: HTTPCONF=nvserv:noauto
Automatically detects virtual servers in MOUNT parameters and notate
each of them as a MOUNT rule to be applied only to a virtual server.
It can be done manually by specifying "nvserv" MountOption
for each MOUNT parameter.
"nvserv:alias" means detecting target servers of host names with
common IP-addresses and notate them as virtual servers.
"nvserv:gen" means notating MOUNT parameters with "genvhost"
MountOption as virtual servers.
"nvserv:auto" is equivalent to "nvserv:alias,gen".
The guessing can be overridden by explicitly specifying
the avserv MountOption for each MOUNT parameter.
"nvserv:none" disables any treatment of virtual servers which are
detected automatically or specified explicitly by the "nvserv" MountOption.