This disables the network scan mode. Neither activating
in openvas.conf nor via the scan configuration will be possible
anymore.

do_network_scan is always false. So, remove
and code path that requires it to be true
and finally remove this variable itself.

The variable network_phase is always FALSE.
So, removing any code path that requires the variable
to be true and finally remove the variable itself.

This change only fixes intending format from
previous commit.

The parameter "only_network" is always false.
So, drop the respective code path from
function plugins_scheduler_init() and finally
the parameter itself.

The network scan status is never set to "busy",
so the respective code paths can be removed.
This includes the removal of function network_scan_status().

NSS_BUSY is never set, so removing the code
paths for it and finally any occurance of it.

NSS_DONE is never the case, so remove any code path
for this case and finally NSS_DONE itself.

NSS_NONE is not explicitly used anymore,
so removing the code paths. This finally also
allows to remove the then unused enum type net_scan_status.

The variable network_scan is always false.
So, remove the code paths and finally the variable itself.

Because it is not used anymore.

After the removal of net_kb, handle_client()
consists only of a few lines and is called only
from a single place.

This module was only supporting the network scan mode
and thus can be removed entirely now.
The NASL API method "plugin_run_nmap" is used
only in a single NASL file in the feed for network
mode to run NSE and it is even protected by "defined_func".

Since it is not used anymore, it can be removed entirely.
The NASL API function "network_targets" is used only
by a single NVT and only for the condition of network scan
phase which is never true.

The NASL API function scan_phase() is not needed
anymore and any related code is removed.

It is not needed/used anymore.