[cocom] Redundant log on every file-open operation

[inishchith]

• A log appears very frequently during the execution of ELK and Graal via the new connector.
• It's related to read file-type operation related to lizard library.

(Not sure why it doesn't show up while executing the lizard-analyzer via the command line interface)

LOG

/usr/local/lib/python3.6/site-packages/lizard_ext/auto_open.py:26: DeprecationWarning: 'U' mode is deprecated
  return open(*args, **kwargs)

(ref. lizard_ext:line)

• In order to reproduce this issue, execute the CoCom-backend task via the micro-mordred with the corresponding connector under elk.

/cc @valeriocos

[valeriocos]

Thanks @inishchith for reporting this issue! I'll check it out!

[valeriocos]

The following PR should fix this issue: https://github.com/chaoss/grimoirelab-graal/pull/52

[inishchith]

@valeriocos If you agree we can close this in reference to #52

[valeriocos]

sure!