oslib-posix: rename socket_set_nonblock() to qemu_set_nonblock()

The fcntl(fd, F_SETFL, O_NONBLOCK) flag is not specific to sockets.
Rename to qemu_set_nonblock() just like qemu_set_cloexec().

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
diff --git a/nbd.c b/nbd.c
index d1a67ee..85187ff 100644
--- a/nbd.c
+++ b/nbd.c
@@ -386,7 +386,7 @@
         [28 .. 151]   reserved     (0)
      */
 
-    socket_set_block(csock);
+    qemu_set_block(csock);
     rc = -EINVAL;
 
     TRACE("Beginning negotiation.");
@@ -429,7 +429,7 @@
     TRACE("Negotiation succeeded.");
     rc = 0;
 fail:
-    socket_set_nonblock(csock);
+    qemu_set_nonblock(csock);
     return rc;
 }
 
@@ -443,7 +443,7 @@
 
     TRACE("Receiving negotiation.");
 
-    socket_set_block(csock);
+    qemu_set_block(csock);
     rc = -EINVAL;
 
     if (read_sync(csock, buf, 8) != 8) {
@@ -558,7 +558,7 @@
     rc = 0;
 
 fail:
-    socket_set_nonblock(csock);
+    qemu_set_nonblock(csock);
     return rc;
 }