[moblab] Fix mobmonitor DiskCheck on wukong
The DiskCheck mobmonitor check doesn't run on wukong.
In some cases, lsblk returns an empty string for the
removable field RM="". Make the regex more robust to find an empty
string and treat it as a valid value.
BUG=chromium:871833
TEST=osutils_unittest.py, systeminfo_unittest.py
Change-Id: I759b27369e4cb0ebdd1f8d87a2f7a6524e73410e
Reviewed-on: https://chromium-review.googlesource.com/1168599
Commit-Ready: Matt Mallett <mattmallett@chromium.org>
Tested-by: Matt Mallett <mattmallett@chromium.org>
Reviewed-by: Keith Haddow <haddowk@chromium.org>
(cherry picked from commit 439a5487f9070864a879ff553282e7fad912679a)
1 file changed
