Improvement: rename the variables in TCP reconnect function and some default constants.

[No-SilverBullet]

What this PR does:

rename the variables in TCP reconnect function and some default constants.

1.rename constant 'reconnectInterval' to defaultReconnectInterval and 'maxTimes' to defaultMaxReconnectAttempts, indicates that these two constants are the default settings.

2.rename vars in reConnect():

• num->sessionNum,indicates the number of current sessions.
• max->maxReconnectAttempts,indicates the maximum attempt times of reconnections.
• times->reconnectAttempts, indicates the current number of reconnect attempts.
• interval->reconnectInterval,indicates the interval between each reconnection.
• maxDuration->maxReconnectInterval, indicates the max interval between each reconnection.

Which issue(s) this PR fixes:
NONE

Special notes for your reviewer:
NONE
Does this PR introduce a user-facing change?:

NONE