test/nvme: Fix the SIGILL when test hotplug in Qemu.

Make sure we have sufficient memory for VM because we will
reserve 1024 2M hugepages for SPDK.

Change-Id: I7c4d10b00e29886804c2b8810234bad1f5b4afdb
Signed-off-by: cunyinch <cunyin.chang@intel.com>
Reviewed-on: https://review.gerrithub.io/365312
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com>

test/lib/nvme/hotplug.sh

@@ -74,7 +74,7 @@ timing_enter start_qemu
 qemu-img create -b "$base_img" -f qcow2 "$test_img"
 
 qemu-system-x86_64 \
-	-daemonize -display none -m 1024 \
+	-daemonize -display none -m 8192 \
 	-pidfile "$qemu_pidfile" \
 	-hda "$test_img" \
 	-net user,hostfwd=tcp::10022-:22 \