When initalizing a connection to psycopg2, in order to use the default
values, the keywords must be missing. So we use a dictionary as a kwarg
and include only the keywords that do not have an empty value on the
module parameters.

Add encoding lines to python modules such that they can take unicode options if they are fed them, since the
AnsibleModule stuff no longer base64 encodes for simplicity and speed reasons.

mysql_db: added 'encoding' and 'collation' args
postgresql_db: added 'owner', 'template' and 'encoding' args

Port the file module over to the new common code infrastructure + cleanup some redundant imports since the module code already imports those things.

passwd -> password
loginpass -> login_password
loginuser -> login_user
loginhost -> login_host

Add an example playbook that shows how to use the modules.

These modules are based on the mysql_db and mysql_user modules.

Currently, the postgresql_user module can only grant all permissions
on a database, fine-grained access has not been implemented yet.

Check file exists instead of relying on the exception. Leave the exception catch in, in case the file is deleted or some other issue crops up

Changing to read from a file pointer instead so that an exception is thrown if the file doesn't exist