test: Streamline test suite a little

This change aims to streamline the integrationtest suite and reduce friction when running (parts of) test suites.

Changes:
- add `test-testname` to makefile to easily run one suite
- made skipping tests first class citizen in test.sh (all available testsuites and the reasons they are skipped are now better exposed and discovered)
- suppress some output of gotest unless there is an error
- no longer build binary for examples and gotest suites
- removed .SILENT from makefile as it being applied to only some targets makes it feel weird (I just learned about this option btw, feel free to comment on this change)
- move individual tests out of `test.sh` and into `test-misc.sh`
- introduced the concept of testsuites to `test.sh`

test/test-shell.sh

@@ -2,7 +2,7 @@
 # simple test harness for testing mgmt
 # NOTE: this will rm -rf /tmp/mgmt/
 
-echo running test-shell.sh
+echo running "$0"
 set -o errexit
 set -o pipefail
 
@@ -21,7 +21,6 @@ fi
 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=""
@@ -67,10 +66,6 @@ for i in $DIR/test/shell/*.sh; do
 	fi
 done
 
-# clean up
-rm -f "$MGMT"
-make clean
-
 if [ "$count" = '0' ]; then
 	fail_test 'No tests were run!'
 fi