Add support for NVMe device

Add support in storage client tests to support NVMe device.

BUG=chromium:655192
TEST=Run StorageQualBase.test.
Verified that all tests (Cryptohome and plain fio tests) passed.

Change-Id: Ieadd636c2f459e45f8e5c06067d9055300bab09c
Signed-off-by: Gwendal Grignou <[email protected]>
Reviewed-on: https://chromium-review.googlesource.com/398158
diff --git a/client/bin/base_utils.py b/client/bin/base_utils.py
index 0384591..16ad864 100644
--- a/client/bin/base_utils.py
+++ b/client/bin/base_utils.py
@@ -786,7 +786,7 @@
     return utils.system_output(cmd)
 
 
-_DISK_DEV_RE = re.compile(r'/dev/sd[a-z]|/dev/mmcblk[0-9]*')
+_DISK_DEV_RE = re.compile(r'/dev/sd[a-z]|/dev/mmcblk[0-9]*|/dev/nvme[0-9]*')
 
 
 def get_disk_from_filename(filename):