Made prepareServices an @BeforeClass

the static initializer code caused useless messages when an
exception was thrown during service startup, move it to BeforeClass
for useful error messages
Stop services after the class is done
Remove services running altogether

we don't need them.
Removed imports
merge ScottDugas: Removed services from unit test

Merge pull request #1587 from ScottDugas/sql-layer/clean-test-initialization
https://github.com/FoundationDB/sql-layer/pull/1587