Add base for DB API

Add DB API layer:
*) create, drop table methods
*) DB API interface layer
*) DB API sqlalchemy implementation

Add DB Models layer:
*) Base Model
*) Create Drop Table by models

Add common oslo wrappers to add 2 new class:
1) TestCase - with DB Fixture
2) NoDBTestCase - without DB Fixture

Add base exceptions

requirements.txt

@@ -1,9 +1,13 @@
 Babel>=0.9.6
+eventlet>=0.9.17
 netaddr>=0.7.6
 iso8601>=0.1.4
-oslo.config
 paramiko>=1.8.0
 pbr>=0.5.21,<1.0
 psutil
+SQLAlchemy>=0.7.8,<0.7.99
 sh
 six
+
+-f http://tarballs.openstack.org/oslo.config/oslo.config-1.2.0a3.tar.gz#egg=oslo.config-1.2.0a3
+oslo.config>=1.2.0a3

tox.ini

@@ -25,6 +25,7 @@ commands = python setup.py testr --coverage --testr-args='{posargs}'
 downloadcache = ~/cache/pip
 
 [flake8]
+ignore = H302
 show-source = true
 builtins = _
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,tools