nodejs.prov: find namespaced bundled dependencies

The previous behaviour assumed that in a bundled package path,
there is always `node_modules` directory on each other spot – i.e.:

npm/node_modules/<dep1>/node_modules/<subdep>
    ^                   ^

With namespaced bundled packages, this is no longer necessary the truth:

npm/node_modules/@nmcli/<dep1>/node_modules/…
    ^                   ! – expected node_modules

---

The previous implementation considered any directory not named
`node_modules` as a package directory, and tried to process it as such.
Among other things, it pruned the list of subdirectories to be processed
to just another `node_modules` subdir, if that existed.
With namespaced packages, this pruning in essence happened too soon,
and so they were skipped altogether.

With this patch applied, only directories that directly contain
the `package.json` file are processed as package directories,
meaning that the walk should correctly descend into namespaces
(even nested ones, if they appear).

Resolves: rhbz#2029904

nodejs.prov

@@ -93,9 +93,9 @@ def generate_dependencies(module_path, module_dir_set=NODE_MODULES):
     else:  # Invalid metadata path
         raise ValueError("Invalid module path '%s'" % module_path)
 
-    for dir_path, subdir_list, __ in os.walk(root_dir):
-        # Currently in node_modules (or similar), continue to subdirs
-        if os.path.basename(dir_path) in module_dir_set:
+    for dir_path, subdir_list, file_list in os.walk(root_dir):
+        # We are only interested in directories that contain package.json
+        if "package.json" not in file_list:
             continue
 
         # Read and format metadata

test/bundled_namespace/node_modules/@nmcli/test201/package.json

@@ -0,0 +1,4 @@
+{
+  "name": "@nmcli/test201",
+  "version": "2.1.4"
+}

test/bundled_namespace/node_modules/test200/package.json

@@ -0,0 +1,4 @@
+{
+  "name": "test200",
+  "version": "1.3.5"
+}

test/bundled_namespace/nodejs.prov.out.exp

@@ -0,0 +1,3 @@
+bundled(nodejs-@nmcli/test201) = 2.1.4
+bundled(nodejs-test200) = 1.3.5
+npm(test) = 4.5.6

test/bundled_namespace/nodejs.req.out.exp

@@ -0,0 +1 @@
+

test/bundled_namespace/package.json.in

@@ -0,0 +1,11 @@
+{
+  "name": "test",
+  "version": "4.5.6",
+  "engines": {
+    "node": ">=6 <10"
+  },
+  "dependencies": {
+    "test100": "^1.2.3",
+    "test101": ">=2.1"
+  }
+}

test/run

@@ -4,7 +4,7 @@ ln -sf nodejs.req nodejs_req.py
 "$(command -v python2 || echo :)" -m doctest nodejs_req.py || exit 1
 "$(command -v python3 || echo :)" -m doctest nodejs_req.py || exit 1
 
-for test in unbundled bundled
+for test in unbundled bundled bundled_namespace
 do
     sed -e "s|//.*$||" < test/$test/package.json.in > test/$test/package.json