~themue/juju-core/053-env-more-script-friendly

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[r=axwalk],[bug=1235717] Fix tools metadata generation for null provider

There's two functional changes here:
 - If there's existing tools metadata, use it
   if it has sha256/size in it, and the tools
   haven't been replaced.
 - Don't use net/http or the tools URL when
   fetching tools to compute sha256/size. That
   doesn't work with sshstorage.
 - Don't fetch existing tools to resolve metadata
   during normal tools syncing operations. Only
   the "juju metadata generate-tools" command
   will do this now.

Additionally, I have refactored
environs/tools/simplestreams.go, to make the
intent of WriteMetadata (now MergeAndWriteMetadata)
more obvious. That function is now composed of
several other more specific functions.

Fixes #1235717

https://codereview.appspot.com/14527043/

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