cc-shim: Use stdin in blocking mode.

Setting stdin as non-blocking and trying to read till be we get
a EGAIN ret value does not work in the terminal case. The tty passed by
docker is set in raw mode, and reading stdin when poll indicates
there is data always results in "Resource not available" error.

Signed-off-by: Archana Shinde <archana.m.shinde@intel.com>

Author: amshinde

shim/shim.c

@@ -645,10 +645,6 @@ main(int argc, char **argv)
 		err_exit("sigaction");
 	}
 
-	if ( !set_fd_nonblocking(STDIN_FILENO)) {
-		exit(EXIT_FAILURE);
-	}
-
 	add_pollfd(poll_fds, &nfds, STDIN_FILENO, POLLIN | POLLPRI);
 
 	add_pollfd(poll_fds, &nfds, shim.proxy_io_fd, POLLIN | POLLPRI);