resilient-stack : add -sla-%s-foo parameter magic

You can provide sla parameters to each request you make.
Parameters are analysed that way.
 * If it starts with "-sla-" it is not transmitted to requested instance and is used to do the request as sla.
 * -sla-foo-bar=example (foo being a magic key) will be use for each request considering "foo" as a key to use and the sla parameter is "bar". So for each group using the "foo" key, sla parameter "bar" is used with value "example"
About magic keys:
We can find 2 kinds of magic keys:
 * id : example, in "-sla-2-foo" 2 is the magic key and the parameter will be used for each request with id 2 (in case of kvm: kvm2 and PBS 2)
 * nameid : example, in "-sla-kvm2-foo", foo will be used for kvm2 request. Name for pbs is "pbs" -> "-sla-pbs2-foo".
IMPORTANT NOTE: in case the same foo parameter is asked for the group, the nameid key prevail
slaprunner: resilient template render during instanciation
resilient-stack: update README for sla magic
check-url: Add check-secure parameter to return success in case of code 401
slaprunner: add promise on cloud9 frontend
slaprunner: update md5sum
Merge branch 'master' into slaprunner
Changelog for 0.78.5, release bump