Standardize format for specifying local file

[docktermj]

Is your feature request related to a problem? Please describe.
It appears that when reading from a local JSON file, the file specification looks like:

/var/opt/senzing/name-of-file.json

However when reading CSV, the file specification looks like:

file:///var/opt/senzing/name-of-file.csv

Describe the solution you'd like
The file naming convention should be the same for all local file specification. Suggestion: Always honor file:// followed by path /var/opt/senzing/name-of-file.json Thus there are 3 slashes: file:///var/opt/senzing/name-of-file.json

[docktermj]

Pull requests:

1. #60