Set swift timeouts higher

Devstack is commonly run in a small slow environment, so bump the
timeouts up.

node_timeout is how long between read operations a node takes to
respond to the proxy server
conn_timeout is all about how long it takes a connect() system call to
return

Change-Id: Ib437466a3fc9274b8aa49b19e4fe7fa26f553419
Co-Authored-By: Peter Portante <peter.portante@redhat.com>
Related-Bug: #1252514