[py3] Increase default MAX_NUMBER_OF_SESSIONS to 10
[py3] Increase default MAX_NUMBER_OF_SESSIONS to 10

cloudera/hue,cloudera/hue,cloudera/hue,cloudera/hue,cloudera/hue,cloudera/hue,cloudera/hue,cloudera/hue,cloudera/hue,cloudera/hue,cloudera/hue,cloudera/hue,cloudera/hue,cloudera/hue,cloudera/hue,cloudera/hue,cloudera/hue,cloudera/hue