scripting: modified all paths to use underscores

For consistency, we want to maintain an enum that can be used to specify
linux repositories and database tables.

BUG=None
TEST=None

Change-Id: I9456dc44025afd461fd43423fec41acccd154742
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/2084015
Reviewed-by: Curtis Malainey <cujomalainey@chromium.org>
Commit-Queue: Hirthanan Subenderan <hirthanan@google.com>
Tested-by: Hirthanan Subenderan <hirthanan@google.com>
diff --git a/contrib/findmissing/common.py b/contrib/findmissing/common.py
index dc17dff..873526d 100755
--- a/contrib/findmissing/common.py
+++ b/contrib/findmissing/common.py
@@ -23,9 +23,9 @@
 
 SUPPORTED_KERNELS = ('4.4', '4.14', '4.19', '5.4')
 
-CHROMEOS_PATH = 'linux-chrome'
-STABLE_PATH = 'linux-stable'
-UPSTREAM_PATH = 'linux-upstream'
+CHROMEOS_PATH = 'linux_chrome'
+STABLE_PATH = 'linux_stable'
+UPSTREAM_PATH = 'linux_upstream'
 
 WORKDIR = os.getcwd()
 DBDIR = os.path.join(WORKDIR, 'database')