Add CAP_BLOCK_SUSPEND

CAP_BLOCK_SUSPEND (since Linux 3.5)
    Employ features that can block system suspend (epoll(7) EPOLLWAKEUP, /proc/sys/wake_lock).

Signed-off-by: Christian Brauner <christianvanbrauner@gmail.com>
Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>

src/lxc/conf.c

@@ -293,6 +293,9 @@ static struct caps_opt caps_opt[] = {
 #ifdef CAP_WAKE_ALARM
 	{ "wake_alarm",        CAP_WAKE_ALARM        },
 #endif
+#ifdef CAP_BLOCK_SUSPEND
+	{ "block_suspend",     CAP_BLOCK_SUSPEND     },
+#endif
 };
 #else
 static struct caps_opt caps_opt[] = {};