sql: move log-schema.sql in the package

related to T1265.

MANIFEST.in

@@ -2,3 +2,4 @@ include Makefile
 include requirements.txt
 include requirements-swh.txt
 include version.txt
+recursive-include swh/core/sql *.sql

swh/core/logger.py

@@ -83,7 +83,7 @@ def stringify(value):
 class PostgresHandler(logging.Handler):
     """log handler that store messages in a Postgres DB
 
-    See swh-core/sql/log-schema.sql for the DB schema.
+    See swh-core/swh/core/sql/log-schema.sql for the DB schema.
 
     All logging methods can be used as usual. Additionally, arbitrary metadata
     can be passed to logging methods, requesting that they will be stored in

swh/core/tests/__init__.py

+from os import path
+import swh.indexer
+
+
+SQL_DIR = path.join(path.dirname(swh.core.__file__), 'sql')

swh/core/tests/test_logger.py

@@ -12,15 +12,13 @@ from nose.plugins.attrib import attr
 from swh.core.logger import PostgresHandler
 from swh.core.tests.db_testing import SingleDbTestFixture
 
-TEST_DIR = os.path.dirname(os.path.abspath(__file__))
-SQL_DIR = os.path.join(TEST_DIR, '../../../sql')
+from swh.core.tests import SQL_DIR
 
 
 @attr('db')
 class PgLogHandler(SingleDbTestFixture, unittest.TestCase):
 
     TEST_DB_DUMP = os.path.join(SQL_DIR, 'log-schema.sql')
-    TEST_DB_DUMP_TYPE = 'psql'
 
     def setUp(self):
         super().setUp()