Install test_server.bin in well known location

This patch installs and uses test_server.bin from
/opt/octavia-tempest-plugin as a well known location on the
filesystem. This way tests, like grenade, that run the devstack
plugins once in /old paths, can find the binary when running from
/new paths.

Change-Id: Ia78f16fde026269dec01f4dceb202842ad12a557

devstack/plugin.sh

@@ -16,9 +16,11 @@ function build_backend_test_server {
     fi
 
     go_path=$(find $DEST/tempest/.tox/tempest/ -name test_server.go)
-    bin_path=${go_path%.go}.bin
+    sudo mkdir -m755 -p /opt/octavia-tempest-plugin
+    sudo chown $STACK_USER /opt/octavia-tempest-plugin
     CGO_ENABLED=0 GOOS=linux go build \
-        -a -ldflags '-s -w -extldflags -static' -o $bin_path \
+        -a -ldflags '-s -w -extldflags -static' \
+        -o /opt/octavia-tempest-plugin/test_server.bin \
         ${DEST}/octavia-tempest-plugin/octavia_tempest_plugin/contrib/test_server/test_server.go
 }
 

octavia_tempest_plugin/config.py

@@ -213,6 +213,10 @@ OctaviaGroup = [
                default='/var/log/octavia-amphora.log',
                help='File path, on the tempest system, to the amphora admin '
                     'log file.'),
+    cfg.StrOpt('test_server_path',
+               default='/opt/octavia-tempest-plugin/test_server.bin',
+               help='Filesystem path to the test web server that will be '
+                    'installed in the web server VMs.'),
 ]
 
 lb_feature_enabled_group = cfg.OptGroup(name='loadbalancer-feature-enabled',

octavia_tempest_plugin/tests/test_base.py

@@ -13,7 +13,6 @@
 #    under the License.
 
 import ipaddress
-import pkg_resources
 import random
 import shlex
 import string
@@ -849,8 +848,7 @@ class LoadBalancerBaseTestWithCompute(LoadBalancerBaseTest):
 
     @classmethod
     def _install_start_webserver(cls, ip_address, ssh_key, start_id):
-        local_file = pkg_resources.resource_filename(
-            'octavia_tempest_plugin.contrib.test_server', 'test_server.bin')
+        local_file = CONF.load_balancer.test_server_path
         dest_file = '/dev/shm/test_server.bin'
 
         linux_client = remote_client.RemoteClient(