Add plugdev group for openocd-0.10.0

This patch adds plugdev group, which is required by openocd-0.10.0.

BUG=chromium:735090
TEST=emerge-fizz openocd

Change-Id: I42a620d783d77ba318dcbe7dc12545bb32edca9e
Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/541939
diff --git a/profiles/base/accounts/group/plugdev b/profiles/base/accounts/group/plugdev
new file mode 100644
index 0000000..d8bbe67
--- /dev/null
+++ b/profiles/base/accounts/group/plugdev
@@ -0,0 +1,3 @@
+group:plugdev
+gid:46
+users:
\ No newline at end of file