(ITS#4491) test020-proxycache flunks --disable-debug

[h.b.furuseth@usit.uio.no]

Full_Name: Hallvard B Furuseth
Version: HEAD
OS: 
URL: 
Submission from: (NULL) (129.240.186.42)
Submitted by: hallvard


test020-proxycache tests for "cacheability" and "answerability"
by grepping the server log.  This breaks with --disable-debug
or if $SLAPD_DEBUG excludes the loglevel which logs that info.

If this must be tested by checking the log, grep the log for
something else which is logged with the same loglevel, and skip
those checks if that is absent.