Add shell based test harness

This allows you to simulate one or more simultaneously running mgmt
processes. It should be easy to use by following the test cases provided.

test/shell/t3.sh

@@ -0,0 +1,67 @@
+#!/bin/bash
+
+. etcd.sh	# start etcd as job # 1
+
+# setup
+mkdir -p "${MGMT_TMPDIR}"mgmt{A..C}
+
+# run till completion
+timeout --kill-after=15s 10s ./mgmt run --file t3-a.yaml --converged-timeout=5 --no-watch &
+timeout --kill-after=15s 10s ./mgmt run --file t3-b.yaml --converged-timeout=5 --no-watch &
+timeout --kill-after=15s 10s ./mgmt run --file t3-c.yaml --converged-timeout=5 --no-watch &
+
+. wait.sh	# wait for everything except etcd
+
+# A: collected
+test -e "${MGMT_TMPDIR}"mgmtA/f3b
+test -e "${MGMT_TMPDIR}"mgmtA/f3c
+test -e "${MGMT_TMPDIR}"mgmtA/f4b
+test -e "${MGMT_TMPDIR}"mgmtA/f4c
+
+# A: local
+test -e "${MGMT_TMPDIR}"mgmtA/f1a
+test -e "${MGMT_TMPDIR}"mgmtA/f2a
+test -e "${MGMT_TMPDIR}"mgmtA/f3a
+test -e "${MGMT_TMPDIR}"mgmtA/f4a
+
+# A: nope!
+test ! -e "${MGMT_TMPDIR}"mgmtA/f1b
+test ! -e "${MGMT_TMPDIR}"mgmtA/f2b
+test ! -e "${MGMT_TMPDIR}"mgmtA/f1c
+test ! -e "${MGMT_TMPDIR}"mgmtA/f2c
+
+# B: collected
+test -e "${MGMT_TMPDIR}"mgmtB/f3a
+test -e "${MGMT_TMPDIR}"mgmtB/f3c
+test -e "${MGMT_TMPDIR}"mgmtB/f4a
+test -e "${MGMT_TMPDIR}"mgmtB/f4c
+
+# B: local
+test -e "${MGMT_TMPDIR}"mgmtB/f1b
+test -e "${MGMT_TMPDIR}"mgmtB/f2b
+test -e "${MGMT_TMPDIR}"mgmtB/f3b
+test -e "${MGMT_TMPDIR}"mgmtB/f4b
+
+# B: nope!
+test ! -e "${MGMT_TMPDIR}"mgmtB/f1a
+test ! -e "${MGMT_TMPDIR}"mgmtB/f2a
+test ! -e "${MGMT_TMPDIR}"mgmtB/f1c
+test ! -e "${MGMT_TMPDIR}"mgmtB/f2c
+
+# C: collected
+test -e "${MGMT_TMPDIR}"mgmtC/f3a
+test -e "${MGMT_TMPDIR}"mgmtC/f3b
+test -e "${MGMT_TMPDIR}"mgmtC/f4a
+test -e "${MGMT_TMPDIR}"mgmtC/f4b
+
+# C: local
+test -e "${MGMT_TMPDIR}"mgmtC/f1c
+test -e "${MGMT_TMPDIR}"mgmtC/f2c
+test -e "${MGMT_TMPDIR}"mgmtC/f3c
+test -e "${MGMT_TMPDIR}"mgmtC/f4c
+
+# C: nope!
+test ! -e "${MGMT_TMPDIR}"mgmtC/f1a
+test ! -e "${MGMT_TMPDIR}"mgmtC/f2a
+test ! -e "${MGMT_TMPDIR}"mgmtC/f1b
+test ! -e "${MGMT_TMPDIR}"mgmtC/f2b