RHEL 7 kernel needs to be built with 9P support

[garlick]

diff -u kernel-3.10.0-x86_64.config.orig kernel-3.10.0-x86_64.config
--- kernel-3.10.0-x86_64.config.orig    2015-04-02 12:18:08.367000000 -0400
+++ kernel-3.10.0-x86_64.config 2015-04-02 12:33:46.338000000 -0400
@@ -1319,7 +1319,14 @@
 CONFIG_RFKILL=m
 CONFIG_RFKILL_LEDS=y
 CONFIG_RFKILL_INPUT=y
-# CONFIG_NET_9P is not set
+CONFIG_NET_9P=m
+CONFIG_NET_9P_VIRTIO=m
+CONFIG_NET_9P_RDMA=m
+CONFIG_NET_9P_DEBUG=y
+CONFIG_9P_FS=m
+CONFIG_9P_FSCACHE=y
+CONFIG_9P_FS_POSIX_ACL=y
+
 # CONFIG_CAIF is not set
 CONFIG_CEPH_LIB=m
 # CONFIG_CEPH_LIB_PRETTYDEBUG is not set