tap: Clean up tap reset path

In tap_handler() if we get an error on the tap device or socket, we use
tap_sock_init() to re-initialise it.  However, what we actually need for
this reset case has remarkably little in common with the case where we're
initialising for the first time:
    * Re-initialising the packet pools is unnecessary
    * The case of a passed in fd (--fd) isn't relevant
    * We don't even call this for pasta mode
    * We will never re-call tap_sock_unix_init() because we never clear
      fd_tap_listen

In fact the only thing we do in tap_sock_init() relevant to the reset case
is to remove the fd from the epoll and close it... which isn't used in the
first initialisation case.

So make a new tap_sock_reset() function just for this case, and simplify
tap_sock_init() slightly as being used only for the first time case.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

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