Scenario: test with concurrent clients
Scenario: test with concurrent clients

Test load balancer with multiple client threads sending requests
concurrently.

Rename _check_connection() to _wait_for_http_service() to better
communicate what this method does.

Extend _send_requests() to accept an optional path argument.

Use screen instead of nohup to background test httpd in CirrOS
instances.

Remove duplicate initialization of server_ips from BaseTestCase.

Change-Id: Ia3fa2ee1977c630e70a13e069e383edfd81ecde8

openstack/octavia,openstack/octavia,openstack/octavia