Inconsistent timeout methodologies on operations [JIRA: CLIENTS-561]

[nerophon]

From customer ticket 11806:

get/put/delete/list_keys etc can all take Timeout as an argument when invoking the operations.

fetch_type, update_type etc does not. Instead they rely on application configuration in riakc with keys 'put_timeout' and 'get_timeout'. if these are not found it will silently fallback on using hard coded macro timeout of 60 seconds (see default_timeout/1 in riakc_pb_socket).

This opens up to potential configuration errors where one needs to make sure all sys.configs set 'get_timeout' and 'put_timeout' accordingly; otherwise one would see very different characteristics of nodes in production and it wouldn't be noticed since they silently use hard coded default values as fallback.