Allow raw socket options for TCP and SSL

This patch lets the user set and use raw socket options as described in
inet:setopts/2 documentation.

The raw options can be useful to use TCP features that are platform-
specific and not supported in inet in general, such as TCP_DEFER_ACCEPT
or TCP_LINGER2 in linux stacks, for example.
Merge branch 'master' of https://github.com/ferd/ranch
Ignore tracking of requests when MaxConn = infinity

There is no need to contact the server and track requests unless being
asked to do so by the user. It's going to be faster and more efficient
to not track anything when being told tracking doesn't matter.

Whenever the max connections is set to infinity, the connections
counting key is not created, or is deleted if it existed already.
When using a numeric value, the connection count is created or
maintained if it existed already.

Moreover, trying to reduce a listener's counter while the max connection
number is set to `infinity` will return 0 and avoid all counting
operations as they are meaningless.
Merge branch 'optimise-conn-count' of https://github.com/ferd/ranch