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Use nonzero SOA MINIMUM for nxdomain-redirect zone

In the "redirect" system test, in order to determine responses to
queries that would normally result in an NXDOMAIN response, ns4 must
resolve records in the "redirect" zone (served by ns3).  If the
"redirect" zone has its SOA MINIMUM field set to 0, ns3 will return
negative responses coming from that zone with a TTL of 0.  This may
trigger false positives for the second nonexist/TXT check in the
"redirect" system test: if ns4 resumes from recursion at a different
Unix timestamp than the one at which it received the NODATA response
from ns3, ns4 will return an NXDOMAIN response to dig instead of the
expected NODATA one (because the cached NODATA response would no longer
be eligible for being used in a response).  Set SOA MINIMUM for the
"redirect" zone on ns3 to 300 seconds, so that it matches the TTL of
positive responses coming from that zone.

The problem described above does not apply to the first nonexist/TXT
check in the "redirect" system test as it employs a "type redirect;"
zone, i.e. does not involve recursion.