sock: add socket management functions

Remove them from xutils, and add them to socket management.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
link: add link management functions

Same here as usual, break out link functions from xutils.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
sig: add signal handling functions

Add an extra file for signal handling functions.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
timer: add time management functions

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
xutils: eliminate xutils, move rest to epoll2

Finally eliminate xutils.{c,h} and move the rest to epoll2.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>