Allow nova plugins install, add blazar plugin

Allow install plugins in nova base container for source builds.
Implement blazar-nova plugin in nova.

Change-Id: I4e3591a3b3d18d5830d32fa25cac5e657b00508c
Partially-Implements: blueprint blazar-images

docker/nova/nova-base/Dockerfile.j2

@@ -57,17 +57,25 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build
 {{ macros.install_packages(nova_base_packages | customizable("packages")) }}
 
 ADD nova-base-archive /nova-base-source
+ADD plugins-archive /
 
 {% set nova_base_pip_packages = [
     '/nova'
 ] %}
 
+{% set nova_base_plugins_pip_packages = [
+    '/plugins/*'
+] %}
+
 RUN ln -s nova-base-source/* nova \
     && {{ macros.install_pip(nova_base_pip_packages | customizable("pip_packages")) }} \
     && mkdir -p /etc/nova/ \
     && cp -r /nova/etc/nova/* /etc/nova/ \
     && chown -R nova: /etc/nova/ \
-    && sed -i 's|^exec_dirs.*|exec_dirs=/var/lib/kolla/venv/bin,/sbin,/usr/sbin,/bin,/usr/bin,/usr/local/bin,/usr/local/sbin|g' /etc/nova/rootwrap.conf
+    && sed -i 's|^exec_dirs.*|exec_dirs=/var/lib/kolla/venv/bin,/sbin,/usr/sbin,/bin,/usr/bin,/usr/local/bin,/usr/local/sbin|g' /etc/nova/rootwrap.conf \
+    && if [ "$(ls /plugins)" ]; then \
+        {{ macros.install_pip(nova_base_plugins_pip_packages) }}; \
+    fi
 
 COPY nova_sudoers /etc/sudoers.d/kolla_nova_sudoers
 RUN chmod 750 /etc/sudoers.d \

kolla/common/config.py

@@ -525,6 +525,10 @@ SOURCES = {
         'type': 'url',
         'location': ('$tarballs_base/nova/'
                      'nova-master.tar.gz')},
+    'nova-base-plugin-blazar': {
+        'type': 'url',
+        'location': ('$tarballs_base/blazar-nova/'
+                     'blazar-nova-master.tar.gz')},
     'octavia-base': {
         'type': 'url',
         'location': ('$tarballs_base/octavia/'

releasenotes/notes/nova-plugins-f3ceab61b19d008a.yaml

@@ -0,0 +1,4 @@
+---
+features:
+  - Support install nova plugins in nova source images.
+  - Install blazar-nova plugin in nova-base source image.