Mutex http request in httplib2.Http().
Mutex http request in httplib2.Http().

Quantum API server asynchronous invokes plugin
methods, but httplib2.Http().request() that we
use in the plugin is not thread safe. The issue
makes API requests to fail randomly and frequently.
This patch fixes the issue.

Signed-off-by: Tomoe Sugihara <6015414ca332492cf0bb4dbbac212276d1c110a7@midokura.com>

midonet/python-midonetclient,midonet/python-midonetclient,midokura/python-midonetclient,midokura/python-midonetclient