Improve SYSTEMTEST running on build time

Use parallel execution on test run. Support already configured
interfaces without special permissions on build. It can either use
already present addresses or configure it on build time. If it has no
rights to configure it, just skip the test and continue.

bind.spec

@@ -207,7 +207,9 @@ BuildRequires:  softhsm
 %endif
 %if %{with SYSTEMTEST}
 # bin/tests/system dependencies
-BuildRequires:  net-tools perl(Net::DNS) perl(Net::DNS::Nameserver)
+BuildRequires:  perl(Net::DNS) perl(Net::DNS::Nameserver) perl(Time::HiRes) perl(Getopt::Long)
+# manual configuration requires this tool
+BuildRequires:  iproute
 %endif
 %if %{with GSSTSIG}
 BuildRequires:  krb5-devel
@@ -843,25 +845,32 @@ sed -e "/^\s*include(/ d" -e 's/^-- use //' \
 %endif
 
 %if %{with SYSTEMTEST}
-if [ "`whoami`" = 'root' ]; then
+# Runs system test if ip addresses are already configured
+# or it is able to configure them
+if perl bin/tests/system/testsock.pl
+then
+	CONFIGURED=already
+else
+	CONFIGURED=
+	sh bin/tests/system/ifconfig.sh up
+	perl bin/tests/system/testsock.pl && CONFIGURED=build
+fi
+if [ -n "$CONFIGURED" ]
+then
   set -e
-  chmod -R a+rwX .
-  pushd bin/tests
-  pushd system
-  ./ifconfig.sh up
-  popd
-  make test
+  pushd build/bin/tests
+  chown -R ${USER} . # Can be unknown user
+  make test %{?_smp_mflags} 2>&1 | tee test.log
   e=$?
-  pushd system
-  ./ifconfig.sh down
-  popd
   popd
+  [ "$CONFIGURED" = build ] && sh bin/tests/system/ifconfig.sh down
   if [ "$e" -ne 0 ]; then
     echo "ERROR: this build of BIND failed 'make test'. Aborting."
     exit $e;
   fi;
 else
-  echo 'only root can run the tests (they require an ifconfig).'
+  echo 'SKIPPED: tests require root, CAP_NET_ADMIN or already configured test addresses.'
+fi
 %endif
 :