build: Rename root pkg path vars.

This renames the variables in the script that runs tests against all
modules to better reflect reality as of the latest versions of Go.

In particular, instead of referring to `ROOTPATH`, it now uses `ROOTPKG`
to better indicate that it is the name of root package as opposed to a
file path to it.

run_tests.sh

@@ -12,15 +12,15 @@ set -e
 go version
 
 # run tests on all modules
-ROOTPATH=$(go list -m)
-ROOTPATHPATTERN=$(echo $ROOTPATH | sed 's/\\/\\\\/g' | sed 's/\//\\\//g')
-MODPATHS=$(go list -m all | grep "^$ROOTPATHPATTERN" | cut -d' ' -f1)
+ROOTPKG=$(go list -m)
+ROOTPKGPATTERN=$(echo $ROOTPKG | sed 's/\\/\\\\/g' | sed 's/\//\\\//g')
+MODPATHS=$(go list -m all | grep "^$ROOTPKGPATTERN" | cut -d' ' -f1)
 for module in $MODPATHS; do
   echo "==> ${module}"
   env GORACE="halt_on_error=1" go test -race ${module}/...
 
   # check linters
-  MODNAME=$(echo $module | sed -E -e "s/^$ROOTPATHPATTERN//" \
+  MODNAME=$(echo $module | sed -E -e "s/^$ROOTPKGPATTERN//" \
     -e 's,^/,,' -e 's,/v[0-9]+$,,')
   if [ -z "$MODNAME" ]; then
     MODNAME=.