Closes-Bug: #1378534
Issue: parallel block writes are not done as the default
       glance worker threads set to 1. This caused
       low throughput during image upload
Fix: Increased glance worker threads to 120 to do
     parallel block writes

Change-Id: Ie0f798940739e9fcdcf4cb636ed683488e2759e7
Merge "Closes-Bug: #1378534 Issue: parallel block writes are not done as the default        glance worker threads set to 1. This caused        low throughput during image upload Fix: Increased glance worker threads to 120 to do      parallel block writes" into R1.30