Make the retry_max and retry_sleep object parameters

Instead of hardcoding these, make them object parameters that default
to the hardcoded, readonly values.  This allows us to set them to
small values in the test suite and speed up 05_dirlock.t
Added another bootstrap dependency on File-ShareDir-Install

If you want to be able to auto-generate the dependencies, then you
need to have everything that the Makefile.PL depends on installed.
efsdeploy itself depends on File-ShareDir-Install, so I added that to
the list of default build modules loaded, and added some feedback on
what was being used, vs skipped.