fix the bugs the rewrite uncovered, in the make engine too

- the wrapper followed one absolute symlink only, and fed the config file to
  env(1) as-is, so a comment or a blank line in /etc/conf.d/myos made every
  command fail with 'env: #comment: No such file or directory'
- verlt called verlte, which does not exist, and used return outside a
  function: it never compared anything
- stat asked for the access time on macOS and the modification time elsewhere,
  so newer/older did not mean the same thing depending on the machine
- setup-docker-group called ansible-user-add-groups, removed with ansible, then
  announced that the user had been added to the docker group. It now runs
  usermod or addgroup, and says so when neither works
- the ssh targets looped over AWS_INSTANCE_IP, which nothing defines since
  make/apps/aws was dropped: they exited 0 having done nothing. They take
  SSH_HOSTS and fail when it is empty
- patsublist left a space before the comma joining two fabio routes
- the JWT macro splits a payload on its commas; documented at the macro, since
  fixing it would change every key it has already produced

spec/golden/cases.txt

@@ -84,3 +84,5 @@ shim-env                        | shim-project  | @make env ARGS=COMPOSE_PROJECT
 chain-build-up-logs             | host-project  | build up logs host/fabio
 chain-up-group                  | host-project  | up ps host
 chain-print-two                 | host-project  | print-COMPOSE_PROJECT_NAME print-APP STACK=host/consul
+mk-ssh-no-hosts                 | app-nogit     | ssh
+mk-ssh-with-hosts               | app-nogit     | ssh SSH_HOSTS=example.test ARGS=id

spec/golden/expected.cli/mk-ssh-no-hosts.txt

@@ -0,0 +1,3 @@
+ERROR: unknown command: ssh
+ERROR: to act on a stack of that name, say what to do: myos up ssh
+[exit 2]

spec/golden/expected.cli/mk-ssh-with-hosts.txt

@@ -0,0 +1,3 @@
+ERROR: unknown command: ssh
+ERROR: to act on a stack of that name, say what to do: myos up ssh
+[exit 2]

spec/golden/expected/mk-ssh-no-hosts.txt

@@ -0,0 +1,3 @@
+ERROR: myos[0] ssh-hosts-check: no remote host: set SSH_HOSTS=host1 host2
+make: *** [ssh-hosts-check] Error 2
+[exit 2]

spec/golden/expected/mk-ssh-with-hosts.txt

@@ -0,0 +1,4 @@
+
+ERROR: myos[0] ssh: Unable to find docker tester-example-test
+make: *** [ssh] Error 2
+[exit 2]