PyTests: do not load addons in load_py_modules test.

It makes no sense to load add-ons here, we already do that (in a more
complete way) in load_addons test, this is only adding overhead and
doubling code to maintain).

Also do not try to load-as-modules add-ons that are not 2.8-ready, and
some other misc fix.

load_py_modules test should be passing again now.

Thanks to @sergey who did part of the work here as well.

tests/python/bl_load_py_modules.py

@@ -41,6 +41,10 @@ BLACKLIST = {
     os.path.join("io_blend_utils", "blender_bam-unpacked.whl"),
 }
 
+for mod in addon_utils.modules():
+    if addon_utils.module_bl_info(mod)['blender'] < (2, 80, 0):
+        BLACKLIST.add(mod.__name__)
+
 # Some modules need to add to the `sys.path`.
 MODULE_SYS_PATHS = {
     # Runs in a Python subprocess, so its expected its basedir can be imported.
@@ -83,13 +87,6 @@ def module_names_all(mod_dir):
     yield from module_names_recursive(mod_dir)
 
 
-def addon_modules_sorted():
-    modules = addon_utils.modules({})
-    modules[:] = [mod for mod in modules if not mod.__file__.startswith(BLACKLIST_DIRS)]
-    modules.sort(key=lambda mod: mod.__name__)
-    return modules
-
-
 def source_list(path, filename_check=None):
     from os.path import join
     for dirpath, dirnames, filenames in os.walk(path):
@@ -102,25 +99,6 @@ def source_list(path, filename_check=None):
                 yield filepath
 
 
-def load_addons():
-    modules = addon_modules_sorted()
-    addons = bpy.context.preferences.addons
-
-    # first disable all
-    for mod_name in list(addons.keys()):
-        addon_utils.disable(mod_name, default_set=True)
-
-    assert(bool(addons) is False)
-
-    for mod in modules:
-        mod_name = mod.__name__
-        if mod_name in BLACKLIST:
-            continue
-        addon_utils.enable(mod_name, default_set=True)
-        if not (mod_name in addons):
-            raise Exception("'addon_utils.enable(%r)' call failed" % mod_name)
-
-
 def load_modules():
     VERBOSE = os.environ.get("BLENDER_VERBOSE") is not None
 
@@ -166,7 +144,9 @@ def load_modules():
     # test we tested all files except for presets and templates
     ignore_paths = [
         os.sep + "presets" + os.sep,
-        os.sep + "templates" + os.sep,
+        os.sep + "templates_osl" + os.sep,
+        os.sep + "templates_py" + os.sep,
+        os.sep + "bl_app_templates_system" + os.sep,
     ] + ([(os.sep + f + os.sep) for f in BLACKLIST] +
          [(os.sep + f + ".py") for f in BLACKLIST])
 
@@ -245,7 +225,6 @@ def load_modules():
 
 
 def main():
-    load_addons()
     load_modules()