Renamed the current preloaded net module to prim_net
and removed the deprecated functions (call, cast, ...).
Introduce a "new" net module (in kernel) as an interface
module to the (preloaded) prim_net. This one also contains
the deprecated functions (call, cast, ...).

OTP-15765

The net module uses socket, but when the system has
been built with --disable-esock, there is no socket...

The SASL file systools_make has a hardcoded list of the
preloaded modules (yuck). This now can handle that the
socket module has been disabled (this is temporary).

OTP-15658

This reverts commit 425889ba69b69a9b6fb14bfbef121d51b78e853a.

This reverts commit 0118046f9bda8dcf3594184fa439b79267db8017.

This reverts commit df130102cdeca8d35fec95a0c926fd1cfec54eab.