travis+make: execute test groups in parallel

scripts/itest_part.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+# Let's work with absolute paths only, we run in the itest directory itself.
+WORKDIR=$(pwd)/lntest/itest
+
+TRANCHE=$1
+NUM_TRANCHES=$2
+
+# Shift the passed parameters by two, giving us all remaining testing flags in
+# the $@ special variable.
+shift
+shift
+
+# Windows insists on having the .exe suffix for an executable, we need to add
+# that here if necessary.
+EXEC="$WORKDIR"/itest.test"$EXEC_SUFFIX"
+LND_EXEC="$WORKDIR"/lnd-itest"$EXEC_SUFFIX"
+echo $EXEC -test.v "$@" -logoutput -goroutinedump -logdir=.logs-tranche$TRANCHE -lndexec=$LND_EXEC -splittranches=$NUM_TRANCHES -runtranche=$TRANCHE
+
+# Exit code 255 causes the parallel jobs to abort, so if one part fails the
+# other is aborted too.
+cd "$WORKDIR" || exit 255
+$EXEC -test.v "$@" -logoutput -goroutinedump -logdir=.logs-tranche$TRANCHE -lndexec=$LND_EXEC -splittranches=$NUM_TRANCHES -runtranche=$TRANCHE || exit 255