Clarify how the sql database is managed

Document that the sql driver handles alembic migrations for you and
remove the unused alembic.ini

Change-Id: I230b3ffe389a149bb63014b9f66962dd374cbac5
diff --git a/doc/source/admin/drivers/sql.rst b/doc/source/admin/drivers/sql.rst
index e208467..34bb470 100644
--- a/doc/source/admin/drivers/sql.rst
+++ b/doc/source/admin/drivers/sql.rst
@@ -28,6 +28,14 @@
       <http://docs.sqlalchemy.org/en/rel_1_0/core/engines.html#database-urls>`_
       for more information.
 
+      The driver will automatically set up the database creating and managing
+      the necesssary tables. Therefore the provided user should have sufficient
+      permissions to manage the database. For example:
+
+      .. code-block:: sql
+
+        GRANT ALL ON my_database TO 'my_user'@'%';
+
 Reporter Configuration
 ----------------------
 
diff --git a/zuul/driver/sql/alembic.ini b/zuul/driver/sql/alembic.ini
deleted file mode 100644
index 0c59505..0000000
--- a/zuul/driver/sql/alembic.ini
+++ /dev/null
@@ -1,69 +0,0 @@
-# A generic, single database configuration.
-
-[alembic]
-# path to migration scripts
-# NOTE(jhesketh): We may use alembic for other db components of zuul in the
-# future. Use a sub-folder for the reporters own versions.
-script_location = alembic_reporter
-
-# template used to generate migration files
-# file_template = %%(rev)s_%%(slug)s
-
-# max length of characters to apply to the
-# "slug" field
-#truncate_slug_length = 40
-
-# set to 'true' to run the environment during
-# the 'revision' command, regardless of autogenerate
-# revision_environment = false
-
-# set to 'true' to allow .pyc and .pyo files without
-# a source .py file to be detected as revisions in the
-# versions/ directory
-# sourceless = false
-
-# version location specification; this defaults
-# to alembic/versions.  When using multiple version
-# directories, initial revisions must be specified with --version-path
-# version_locations = %(here)s/bar %(here)s/bat alembic/versions
-
-# the output encoding used when revision files
-# are written from script.py.mako
-# output_encoding = utf-8
-
-sqlalchemy.url = mysql+pymysql://user@localhost/database
-
-# Logging configuration
-[loggers]
-keys = root,sqlalchemy,alembic
-
-[handlers]
-keys = console
-
-[formatters]
-keys = generic
-
-[logger_root]
-level = WARN
-handlers = console
-qualname =
-
-[logger_sqlalchemy]
-level = WARN
-handlers =
-qualname = sqlalchemy.engine
-
-[logger_alembic]
-level = INFO
-handlers =
-qualname = alembic
-
-[handler_console]
-class = StreamHandler
-args = (sys.stderr,)
-level = NOTSET
-formatter = generic
-
-[formatter_generic]
-format = %(levelname)-5.5s [%(name)s] %(message)s
-datefmt = %H:%M:%S