Update account generator calls with correct password

Change I380dd20e5ed716a0bdf92aa02c3730359b8136e4 updated the tempest
configuration to stop creating a bunch of globals. But as part of
that refactor it started using $admin_password as the password
argument for tempest-account generator, which is never defined.
This commit rectifies the situation by using the correct variable
$password.

Change-Id: Ieeed58751e5784020e04bcc2911ac74791662110

Author: mtreinish

lib/tempest

@@ -554,9 +554,9 @@ function configure_tempest {
     iniset $TEMPEST_CONFIG auth tempest_roles "Member"
     if [[ $TEMPEST_USE_TEST_ACCOUNTS == "True" ]]; then
         if [[ $TEMPEST_HAS_ADMIN == "True" ]]; then
-            tempest-account-generator -c $TEMPEST_CONFIG --os-username $admin_username --os-password $admin_password --os-tenant-name $admin_tenant_name -r $TEMPEST_CONCURRENCY --with-admin etc/accounts.yaml
+            tempest-account-generator -c $TEMPEST_CONFIG --os-username $admin_username --os-password "$password" --os-tenant-name $admin_tenant_name -r $TEMPEST_CONCURRENCY --with-admin etc/accounts.yaml
         else
-            tempest-account-generator -c $TEMPEST_CONFIG --os-username $admin_username --os-password $admin_password --os-tenant-name $admin_tenant_name -r $TEMPEST_CONCURRENCY etc/accounts.yaml
+            tempest-account-generator -c $TEMPEST_CONFIG --os-username $admin_username --os-password "$password" --os-tenant-name $admin_tenant_name -r $TEMPEST_CONCURRENCY etc/accounts.yaml
         fi
         iniset $TEMPEST_CONFIG auth use_dynamic_credentials False
         iniset $TEMPEST_CONFIG auth test_accounts_file "etc/accounts.yaml"