component/openssh: allow to check a successfull build

component/openssh/buildout.cfg

@@ -27,4 +27,13 @@ environment =
 configure-options = 
   --prefix=${buildout:parts-directory}/${:_buildout_section_name_}
   --exec-prefix=${buildout:parts-directory}/${:_buildout_section_name_}
-  --with-privsep-path=${buildout:parts-directory}/${:_buildout_section_name_}/var/empty
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+  --with-privsep-path=${buildout:parts-directory}/${:_buildout_section_name_}/var/empty
+
+[openssh-output]
+# Shared binary location to ease migration
+recipe = plone.recipe.command
+stop-on-error = true
+update-command = ${:command}
+command = ${coreutils-output:test} -x ${:ssh} -a -x ${:keygen}
+ssh = ${openssh:location}/bin/ssh
+keygen = ${openssh:location}/bin/ssh-keygen
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