fix(db): Make using pg_service work again. When I did the merge of schema support I broke pg_service.conf support by replacing get_database_name with db_schema_split. This commit fixes it. Also this commit returns the schema if one is specified in pg_service.conf. back_postgresql.py: Replace calls to db_schema_split() with get_database_schema_names() (new name for get_database_name()). Rename db_schema_split to _db_schema_split. It now returns a tuple (dbname, schema) rather than a list. It is used only by get_database_schema_names() which also returns tuples. get_database_schema_names() can also get schema info for the service (if present) as specified by pg_service.conf. Add get_database_user() to get the user from either RDBMS_USER or pg_service.conf. (User needed for creating schema, so not needed before schema patch. import re at the top of file and remove lower import. Remove some schema code from db_command as it's not needed. The database conection is done to either postgresql or template1 existing databases. This command never connects to the roundp specified db. test/test_postgresql.py: Reorganize top level imports, add import os. Replace import of db_schema_split with get_database_schema_names. Also replace calls to db_schema_split. Create new Opener for the service file. Set PGSERVICEFILE to point to test/pg_service.conf. Add three new classes to test Service: 1) using regular db 2) using schema within db 3) Unable to parse schema name from pg_service.conf. The last doesn't need a db. Number 1 and 2 reuse the tests in ROTest to verify db connectivity. test/pg_service.conf: three service connections for: db only, db and schema, and incorrectly specified schema test cases. doc/upgrading.txt: updated to current status. Included example schema definition in service file.

A number of tests uses the infrastructure of
	db_test_base.py

grep "from db_test_base" -l *.py
benchmark.py
session_common.py
test_anydbm.py
test_indexer.py
test_memorydb.py
test_mysql.py
test_postgresql.py
test_security.py
test_sqlite.py
test_userauditor.py

grep "import db_test_base" -l *.py
test_cgi.py
test_jinja2.py
test_mailgw.py
test_xmlrpc.py

grep "import memory\|from memory" -l *.py 
test_mailgw.py
test_memorydb.py


The remaining lines are an 2001 description from Richard,
which probably is outdated:

Structure of the tests:

   1   Test date classes
   1.1 Date
   1.2 Interval
   2   Set up schema
   3   Open with specific backend
   3.1 anydbm
   4   Create database base set (stati, priority, etc)
   5   Perform some actions
   6   Perform mail import
   6.1 text/plain
   6.2 multipart/mixed (with one text/plain)
   6.3 text/html
   6.4 multipart/alternative (with one text/plain)
   6.5 multipart/alternative (with no text/plain)