Fix _get_images_dir when pip-installed with --user

There are two cases where pip installs kolla share into ~/.local/share/kolla:

- with `pip install --user kolla`
- with `pip install kolla` as non-root

This patch helps kolla find the share dir in these cases.

Closes-Bug: #1930544

Change-Id: I0b3eb6744a34a601266179fb358510a5c500e6ba
(cherry picked from commit db78657)

Author: jpic

kolla/image/build.py

@@ -790,6 +790,7 @@ def _get_images_dir(self):
             PROJECT_ROOT,
             os.path.join(sys.prefix, 'share/kolla'),
             os.path.join(sys.prefix, 'local/share/kolla'),
+            os.path.join(os.getenv('HOME', ''), '.local/share/kolla'),
             # NOTE(zioproto): When Kolla is used within a snap, the env var
             #                 $SNAP is the directory where the snap is mounted.
             #                 https://github.com/zioproto/snap-kolla

releasenotes/notes/bug-1930544-a8926990f3a578a9.yaml

@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+    Fix support for kolla install in ``~/.local``. `LP#1930544
+    <https://launchpad.net/bugs/1930544>`__