Add note about repository suite choices

Change-Id: If9de5aa04a249283f1f9f9f4b86cc18aef2d1da2
Reviewed-on: https://review.gerrithub.io/374148
Reviewed-by: Dennis Dmitriev <dis.xcom@gmail.com>
Tested-by: Dennis Dmitriev <dis.xcom@gmail.com>
diff --git a/README.md b/README.md
index 7ebd3e2..0f0ebd4 100644
--- a/README.md
+++ b/README.md
@@ -43,12 +43,18 @@
 export LAB_CONFIG_NAME=virtual-mcp11-dpdk  # OVS-DPDK with neutron packages
 ```
 
+Set packages repository
+-----------------------
+Note: The recommended repo is `testing`. Possible choices: stable, testing, nightly. Nightly contains latest packages.
+```
+export REPOSITORY_SUITE=testing
+```
+
 Run deploy test
 ---------------
 ```
 export IMAGE_PATH1604=./xenial-server-cloudimg-amd64.qcow2
 export SHUTDOWN_ENV_ON_TEARDOWN=false  # Optional
-export REPOSITORY_SUITE=testing
 
 LC_ALL=en_US.UTF-8  py.test -vvv -s -k test_tcp_install_default
 ```
@@ -58,7 +64,6 @@
 ```
 export IMAGE_PATH1604=./xenial-server-cloudimg-amd64.qcow2
 export SHUTDOWN_ENV_ON_TEARDOWN=false  # Optional
-export REPOSITORY_SUITE=testing
 
 LC_ALL=en_US.UTF-8  py.test -vvv -s -k test_tcp_install_run_rally
 ```
@@ -68,11 +73,11 @@
 ```
 export IMAGE_PATH1604=./xenial-server-cloudimg-amd64.qcow2
 export SHUTDOWN_ENV_ON_TEARDOWN=false  # Optional
-export REPOSITORY_SUITE=testing
 
 LC_ALL=en_US.UTF-8  py.test -vvv -s -k test_oss_install_default
 ```
 
+
 Run deploy test for mk22-qa-lab01 (outdated)
 --------------------------------------------
 Note: This lab is not finished yet. TBD: configure vsrx node