Optimize neutron-api waiting cycle

Currently there're 60 attempts to reach Neutron API with short delays between
them. It leads to very slow deployment failure in case of network problems,
because client's connection to server hangs for 60 seconds itself.
The idea is to change default timeout for Neutron HTTP connection.

Change-Id: Icc4caa3c4eb3d22f24ff9ae7066ad1e60e65bb18
Related-bug: #1384332
Merge "Optimize neutron-api waiting cycle"