Adds unittests for create_table and list_table

Change-Id: Ie5ce0238f4c589aa7cefaa3f60477601df682f32
Partial-Bug: #1294078
Separate parsers for DynamoDB and OpenStack APIs

Use two different request/responce parsers
for DynamoDB API and restful  OpenStack API

Change-Id: I184f0951f4afe8af8da6ede13a723599ef84309b