Add Redis connection parameters full control

[pierre-claranet]

SUMMARY

In Ansible Redis facts cache plugin, add Redis connection parameters full access in order to be able to set advanced socket options, like enabling keep alive for example.

ISSUE TYPE

• Feature Pull Request

COMPONENT NAME

redis cache

ADDITIONAL INFORMATION

The parameter Ansible facts cache parameter fact_caching_connection accepts (for Redis cache plugin) a new URI format (the 2 other formats are still accepted too): key=value pairs, separated by &. Keys are Redis Python connection parameters name. See https://redis-py2.readthedocs.io/en/latest/ for parameters name and accepted values.