Update RSpec tests to support netrc/netrc version 0.7.8. Includes:

* Stab readable? method because new netrc checks whether home dir is readable
* Switch from raw equality on the response of Netrc.read to checking the values inside the object (as we do when we use it for real). This handles the change from an array to a Struct in netrc 0.7.8: https://github.com/geemus/netrc/commit/e6939fd057af7613240497f4267cffd69c274d09
Merge pull request #226 from mortardata/ddaniels_netrc_0_7_8

[#80787586] Update RSpec tests to support netrc/netrc version 0.7.8