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/test-shell.sh

@@ -0,0 +1,63 @@
+#!/bin/bash
+# simple test harness for testing mgmt
+# NOTE: this will rm -rf /tmp/mgmt/
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+LINE=$(printf '=%.0s' `seq -s ' ' $(tput cols)`)	# a terminal width string
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && cd .. && pwd )"	# dir!
+cd "$DIR" >/dev/null	# work from main mgmt directory
+make build
+MGMT="$DIR/test/shell/mgmt"
+cp -a "$DIR/mgmt" "$MGMT"	# put a copy there
+failures=""
+
+# loop through tests
+for i in $DIR/test/shell/*.sh; do
+	[ -x "$i" ] || continue	# file must be executable
+	# TODO: if ARGV has test names, only execute those!
+	ii=`basename "$i"`	# short name
+	cd $DIR/test/shell/ >/dev/null	# shush the cd operation
+	mkdir -p '/tmp/mgmt/'	# directory for mgmt to put files in
+	#echo "Running: $ii"
+	set +o errexit	# don't kill script on test failure
+	export MGMT_TMPDIR='/tmp/mgmt/'	# we can add to env like this
+	out=$($i 2>&1)	# run and capture stdout & stderr
+	e=$?	# save exit code
+	set -o errexit	# re-enable killing on script failure
+	cd - >/dev/null
+	rm -rf '/tmp/mgmt/'	# clean up after test
+	if [ $e -ne 0 ]; then
+		# store failures...
+		failures=$(
+			# prepend previous failures if any
+			[ -n "${failures}" ] && echo "$failures" && echo "$LINE"
+			echo "Script: $ii"
+			# if we see 124, it might be the exit value of timeout!
+			[ $e -eq 124 ] && echo "Exited: $e (timeout?)" || echo "Exited: $e"
+			if [ "$out" = "" ]; then
+				echo "Output: (empty!)"
+			else
+				echo "Output:"
+				echo "$out"
+			fi
+		)
+	else
+		echo -e "ok\t$ii"	# pass
+	fi
+done
+
+# clean up
+rm -f "$MGMT"
+make clean
+
+# display errors
+if [[ -n "${failures}" ]]; then
+	echo 'FAIL'
+	echo 'The following tests failed:'
+	echo "${failures}"
+	exit 1
+fi
+echo PASS