(PUP-2218) Use /etc/yum.conf for yumrepo default location
(maint) refactor find_conf_value to use PhysicalFile
(maint) Update yumrepo inifile provider comments
(maint) expand yumrepo inifile inline documentation.
(PUP-1840) Use binary mode for files

Understanding the checksums for files requires that we are very careful
about how data is written and read. This is to avoid having a windows
system translate line endings and causing the data on disk to be
different from what the tests expect.
Merge pull request #2598 from zaphod42/issue/master/pup-1840-use-binread-on-windows

(PUP-1840) Use binary mode for files
Merge branch 'bugfix/stable/pup-2218-yumrepo-use-yumconf' into stable
Merge branch 'stable'
Merge branch 'master' of https://github.com/puppetlabs/puppet