Provide a mechanism for setting __OW_IGNORE_CERTS when deployed without certs

The idea is when running an action that in turn invokes another action using one of the client libraries, it should automatically have the __OW_IGNORE_CERTS env var set.

Related to https://github.com/apache/incubator-openwhisk-client-js/issues/101

@rabbah - FYI

Start by reading the related openwhisk-client-js issue and tracing how an action invokes another action through the client libraries. Determine where deployment without certificates is detected and where environment variables are established; done means nested action invocations automatically receive __OW_IGNORE_CERTS when appropriate.

Written by the indexing model from the issue text.