[Tests] installation_node: only match top-level global packages

test/installation_node/install while reinstalling packages

@@ -73,18 +73,18 @@ npm list --global | grep object-is > /dev/null || die "object-is isn't installed
 # install a fresh global package on the source (v9.7.0) only
 nvm use 9.7.0
 npm install -g is-nan@1.0.1 || die "npm install -g is-nan failed"
-npm list --global | grep is-nan > /dev/null || die "is-nan isn't installed on v9.7.0"
+npm list --global --depth=0 | grep is-nan > /dev/null || die "is-nan isn't installed on v9.7.0"
 
 # precondition: the already-installed target (v9.10.0) must not have it yet
 nvm use 9.10.0
-npm list --global | grep is-nan > /dev/null && die "is-nan should not be installed on v9.10.0 before reinstall"
+npm list --global --depth=0 | grep is-nan > /dev/null && die "is-nan should not be installed on v9.10.0 before reinstall"
 
 # target is already installed, so this should report so AND still migrate packages
 OUTPUT="$(nvm install --reinstall-packages-from=9.7.0 9.10.0 2>&1)" || die "nvm install --reinstall-packages-from=9.7.0 9.10.0 failed: ${OUTPUT}"
 nvm_echo "${OUTPUT}" | grep "is already installed" > /dev/null || die "expected 'already installed' message, got: ${OUTPUT}"
 
 nvm use 9.10.0
-npm list --global | grep is-nan > /dev/null || die "is-nan was not migrated to already-installed v9.10.0"
+npm list --global --depth=0 | grep is-nan > /dev/null || die "is-nan was not migrated to already-installed v9.10.0"
 
 
 # ...the same is true for default packages: they must install on the already-installed path too.
@@ -99,11 +99,11 @@ nvm_echo 'object-inspect@1.0.2' > "${DEFAULT_PACKAGES_FILE}"
 
 # precondition: the already-installed target must not have the default package yet
 nvm use 9.10.0
-npm list --global | grep object-inspect > /dev/null && die "object-inspect should not be installed on v9.10.0 before default-packages test"
+npm list --global --depth=0 | grep object-inspect > /dev/null && die "object-inspect should not be installed on v9.10.0 before default-packages test"
 
 nvm install 9.10.0 > /dev/null 2>&1 || die "nvm install 9.10.0 (already installed, default-packages) failed"
 nvm use 9.10.0
-npm list --global | grep object-inspect > /dev/null || die "default packages were not installed on already-installed v9.10.0"
+npm list --global --depth=0 | grep object-inspect > /dev/null || die "default packages were not installed on already-installed v9.10.0"
 
 # restore the default-packages file before the next assertion
 cleanup