convert client certificate hostnames to lowercase

[alexskr]

in some edge cases :fqdn can contain capital letters which will cause the following error

Error: Could not initialize global default settings: Certificate names must be lower case; see #1168

This change lowercases cert name

[ghoneycutt]

Thanks @alexskr !

We need a corresponding spec test that shows if $certname is capitalized that the ini setting is lowe case.

[ghoneycutt]

There should also be a comment in the code that links to the bug number you mentioned above so it is explained why this is needed.

[alexskr]

Good idea! how does this look?