[FIX] modules: choose the right addons path

When launching a server with two similar addons path, e.g.:
- /home/alice/dev
- /home/alice/devodoo

launching the server in dev mode may crash due to the poor matching using
`path.startswith(...)` method which may make `/home/alice/devodoo/bob/main.xml`
match in addons folder `/home/alice/dev` and with a non-exitant local path
`odoo/bob/main.xml`.

Instead of relying on the name, use the `os.path.commonprefix()` method to match
on real paths and avoid partial matching.
commonprefix will only work if the folder name ends with the appropriate
separator (which is not guarantee for a user provided addons-path) so force a
trailing `/` using os.path.join(..., '')`.

Closes #12359

openerp/modules/module.py

@@ -177,9 +177,16 @@ def get_resource_from_path(path):
     :rtype: tuple
     :return: tuple(module_name, relative_path, os_relative_path) if possible, else None
     """
-    resource = [path.replace(adpath, '') for adpath in ad_paths if path.startswith(adpath)]
+    resource = False
+    for adpath in ad_paths:
+        # force trailing separator
+        adpath = os.path.join(adpath, "")
+        if os.path.commonprefix([adpath, path]) == adpath:
+            resource = path.replace(adpath, "", 1)
+            break
+
     if resource:
-        relative = resource[0].split(os.path.sep)
+        relative = resource.split(os.path.sep)
         if not relative[0]:
             relative.pop(0)
         module = relative.pop(0)