[Bug 685201] [NEW] shutdown_lifetime setting behavior does not match doc

[AlainKnaff]

Public bug reported:

Binary package hint: squid

When shutting down squid, squid waits for 30 seconds (shutdown_lifetime
setting) even if no active client is present, however, the doc says it
would.

Moreover the doc says that this also applies to SIGHUP, but
(fortunately...) it doesn't.

Proposed fix:
1. Change the code to only wait if there are indeed clients connected. If last client disconnected before wait time is up, exit at that point.
2. Change doc to say " When SIGTERM is received, the cache is put into..." rather than "When SIGTERM or SIGHUP is received..."

** Affects: squid (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/685201

Title:
  shutdown_lifetime setting behavior does not match doc