Changed configuration of testr to use file based sqlite database.
Database name will be finally configured in solar/conftest.py
for each process.
If --clean flag will be provided to py.test - database will be removed
after testrun.
All dblayer patches were removed from solar/__init__.py to
solar/dblayer/__init__.py to avoid patching of sqlite client
Change-Id: I615be46aecbb0b88a1088f5a379f10ba95ae9aad
Changed default database to sqlite
Changed how solar_db config is defined
Removed lupa from test-requirements
Removed riak from requirements
Testr uses :memory: sqlite
Closes-Bug: #1526286
Change-Id: I709d19a192f800e9a67d9c7657f286ff0b343053
Dmitry Shulyak