Tony Breeds 536b8c1d2c Allow screen without logging to disk ...

In some niche setups it is desirable to run OpenStack services under
screen, but undesirable to automatically keep a persistent log from
each service.

Add a new variable SCREEN_IS_LOGGING that controls if screen logs each
window to disk automatically.

Ideally screen itself would be configured to log but just not activate.
This isn't possible with the screerc syntax.  Temporary logging can still
be used by a developer with:
    C-a : logfile foo
    C-a : log on

Change-Id: I2a3abf15dea95ae99ddbdfe1309382df601b7d93

2015-11-11 06:21:45 +11:00

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