system-dpdk: Use a different character marker for sed commands

The default marker for sed commands according to the manual is /, but this
is inconvenient when working with paths.  The solution is either to escape
all instances of / or use sed's \cREGEXc feature.

Signed-off-by: Aaron Conole <aconole@redhat.com>
Signed-off-by: Ian Stokes <ian.stokes@intel.com>

tests/system-dpdk.at

@@ -65,12 +65,12 @@ AT_CHECK([grep "VHOST_CONFIG: /tmp/dpdkvhostclient0: reconnecting..." ovs-vswitc
 
 dnl Clean up
 AT_CHECK([ovs-vsctl del-port br10 dpdkvhostuserclient0], [], [stdout], [stderr])
-OVS_VSWITCHD_STOP(["/does not exist. The Open vSwitch kernel module is probably not loaded./d
-/Failed to enable flow control/d
-/failed to connect to \/tmp\/dpdkvhostclient0: No such file or directory/d
-/Global register is changed during/d
-/EAL:   Invalid NUMA socket, default to 0/d
-/EAL: WARNING: cpu flags constant_tsc=yes nonstop_tsc=no -> using unreliable clock cycles !/d
-/EAL: No free hugepages reported in hugepages-1048576kB/d"])
+OVS_VSWITCHD_STOP(["\@does not exist. The Open vSwitch kernel module is probably not loaded.@d
+\@Failed to enable flow control@d
+\@VHOST_CONFIG: failed to connect to /tmp/dpdkvhostclient0: No such file or directory@d
+\@Global register is changed during@d
+\@EAL:   Invalid NUMA socket, default to 0@d
+\@EAL: WARNING: cpu flags constant_tsc=yes nonstop_tsc=no -> using unreliable clock cycles !@d
+\@EAL: No free hugepages reported in hugepages-1048576kB@d"])
 AT_CLEANUP
 dnl --------------------------------------------------------------------------