Added pymysql as default DBAPI

pymysql does not require any system dependencies so it just
requires a pip install unlike MySQL-Python.

Change-Id: I4839e2995869b6dc857052632701affbd9bfcc5e

etc/octavia.conf

@@ -9,11 +9,11 @@
 [database]
 # This line MUST be changed to actually run the plugin.
 # Example:
-# connection = mysql://root:pass@127.0.0.1:3306/octavia
+# connection = mysql+pymysql://root:pass@127.0.0.1:3306/octavia
 # Replace 127.0.0.1 above with the IP address of the database used by the
 # main octavia server. (Leave it as is if the database runs on this host.)
 
-# connection = sqlite://
+# connection = mysql+pymysql://
 
 # NOTE: In deployment the [database] section and its connection attribute may
 # be set in the corresponding core plugin '.ini' file. However, it is suggested

octavia/db/migration/alembic.ini

@@ -20,7 +20,7 @@ script_location = %(here)s/alembic_migrations
 # versions/ directory
 # sourceless = false
 
-sqlalchemy.url = mysql://root:password@localhost/octavia
+sqlalchemy.url = mysql+pymysql://root:password@localhost/octavia
 
 
 # Logging configuration

requirements.txt

@@ -32,6 +32,7 @@ oslo.middleware>=0.1.0                  # Apache-2.0
 oslo.rootwrap>=1.3.0
 oslo.serialization>=1.0.0               # Apache-2.0
 oslo.utils>=1.0.0                       # Apache-2.0
+PyMySQL>=0.6.3
 python-barbicanclient>=3.0
 python-keystoneclient>=0.11.1
 python-novaclient>=2.17.0