Addressed ValueError: too many values to unpack (expected 2)

[bchan77]

disk_io_failure_detection_py3.py would throw below exception if when server.conf has multiple = characters in a line such as "--ysql_pg_conf_csv="shared_preload_libraries=passwordcheck""

Traceback (most recent call last):
  File "/home/yugabyte/disk_io_failure_detection_py3.py", line 157, in <module>
    config_dict = parse_config_file(DEFAULT_HOME_DIR + process + CONF_PATH)
  File "/home/yugabyte/disk_io_failure_detection_py3.py", line 121, in parse_config_file
    key, value = line[2:].split('=')
ValueError: too many values to unpack (expected 2)

The fix is simple, asking split to use take the first = and ignore the rest of =

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