Check for test interfaces before running system tests

Prevent runall.sh and "make test" from even attempting to run system
tests when "ifconfig.sh up" has not been run beforehand.  This ensures
the user is not flooded with error messages in such a case.

(cherry picked from commit e0221f2d25)

bin/tests/system/Makefile.in

@@ -96,6 +96,13 @@ parallel.mk:
 # Targets to run the tests.
 
 test: parallel.mk subdirs
+	@if ! ${PERL} testsock.pl > /dev/null 2>&1; then					  \
+		echo "I:NOTE: System tests were skipped because they require that the"		; \
+		echo "I:      IP addresses 10.53.0.1 through 10.53.0.8 be configured"		; \
+		echo "I:      as alias addresses on the loopback interface.  Please run"	; \
+		echo "I:      \"bin/tests/system/ifconfig.sh up\" as root to configure them."	; \
+		exit 1										; \
+	fi
 	@$(MAKE) -f parallel.mk check
 	@$(SHELL) ./runsequential.sh -r
 	@$(SHELL) ./testsummary.sh

bin/tests/system/testsummary.sh

@@ -37,15 +37,6 @@ if [ $keepfile -eq 0 ]; then
     rm -f */test.output
 fi
 
-$PERL testsock.pl || {
-    cat <<EOF
-I:NOTE: System tests were skipped because they require that the
-I:      IP addresses 10.53.0.1 through 10.53.0.8 be configured
-I:      as alias addresses on the loopback interface.  Please run
-I:      "bin/tests/system/ifconfig.sh up" as root to configure them.
-EOF
-}
-
 status=0
 echo "I:System test result summary:"
 grep '^R:' systests.output | cut -d':' -f3 | sort | uniq -c | sed -e 's/^/I:/'