Capitalization of the name OpenSSL

Skimming over SSL code and docs I noticed that we almost always properly
capitalize “OpenSSL" when referring to the name of the library, using "openssl”
for when referring to the cli application.  The attached patch fixes the few
occurrences where the name is referred to, but which aren’t spelled “OpenSSL”.
Also moves the link to openssl.org to using https:// as it redirects anyways.

cheers ./daniel