fixup! runUnitTest: expand ~ in bt5_path and warn user about invalid bt5 path passed to test runner

Suppport ~ also in VCS tab. Not working in current slapos instance that set $HOME to something completely different

product/ERP5/Document/BusinessTemplate.py

@@ -5410,6 +5410,7 @@ Business Template is a set of definitions, such as skins, portal types and categ
       from App.config import getConfiguration
       instance_home = getConfiguration().instancehome
       for path in (preferences.getPreferredWorkingCopyList() or ['bt5']):
+        path = os.path.expanduser(path)
         if not os.path.isabs(path):
           path = os.path.join(instance_home, path)
         bt_path = os.path.join(path, bt_name)

product/ERP5Type/tests/ERP5TypeTestCase.py

@@ -469,7 +469,7 @@ class ERP5TypeTestCaseMixin(ProcessingNodeTestCase, PortalTestCase):
           if errcode == 200:
             return urltype + ':' + url
         else:
-          path_list = glob(os.path.join(path, template))
+          path_list = glob(os.path.join(os.path.expanduser(path), template))
           if path_list:
             return path_list[0]
 

product/ERP5VCS/WorkingCopy.py

@@ -123,7 +123,7 @@ class WorkingCopy(Implicit):
     except ValueError:
       pass
     # Allow symlinks inside instance home.
-    path = os.path.normpath(path)
+    path = os.path.normpath(os.path.expanduser(path))
     real_path = os.path.realpath(path)
     if restricted and not any(
         issubdir(allowed, path) or issubdir(allowed, real_path)