Oracle DataBase module

execution module; can connect to multiple dbs described in pillar and
run sql-query
fix some pylint warnings
fix some pylint warnings
rewrite dict comprehension
allow hierarchical credentials

used for store 'default' and 'sys as sysdba' database connection:
my_db:
uri: user/pass@host/db
dba:
uri: sys/syspass@host/db as sysdba

oracle.run_query my_db:dba "select * from dba_users"
Merge pull request #13999 from bormotov/develop

Oracle DataBase module