Adds paramiko logs to console output

* Adds paramiko log handler to default_log_level

Change-Id: I65b3a544e6a6fc0943c733619b20f3e63cf2aa7e
Closes-Bug: #1200621
Add mock to test-requirements.txt

mock is used by the oslo incubator test fixtures in mockpatch. So this
patch ensures it gets installed by adding it to the test requirements
list.

Change-Id: Ib3a1a074143595247790084c04edfc36e19cd94f
Merge "Add mock to test-requirements.txt"
Merge "Adds paramiko logs to console output"