internals: rename the SessionHandle struct to Curl_easy

URLs: change http to https in many places

Closes #754

vauth: Removed the need for a separate GSS-API based SPN function

krb5: Moved host from Curl_auth_create_gssapi_user_message() to be argument

For consistency with the spnego and oauth2 code moved the setting of
the host name outside of the Curl_auth_cr

krb5: Moved host from Curl_auth_create_gssapi_user_message() to be argument

For consistency with the spnego and oauth2 code moved the setting of
the host name outside of the Curl_auth_create_gssapi_user_messag()
function.

This will allow us to more easily override it in the future.

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vauth: Moved the Negotiate authentication code to the new vauth directory

Part 2 of 2 - Moved the GSS-API based Negotiate authentication code.

vauth: Moved the Negotiate authentication code to the new vauth directory

Part 1 of 2 - Moved the SSPI based Negotiate authentication code.

vauth: Refactored function names after move to new vauth directory

Renamed all the SASL functions that moved to the new vauth directory to
include the correct module name.

vauth: Updated the copyright year after recent changes

As most of this work was performed in 2015 but not pushed until 2016
updated the copyright year to reflect the public facing change

vauth: Updated the copyright year after recent changes

As most of this work was performed in 2015 but not pushed until 2016
updated the copyright year to reflect the public facing changes.

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vauth: Moved the OAuth 2.0 authentication code to the new vauth directory

vauth: Moved the NTLM authentication code to the new vauth directory

vauth: Moved the Kerberos V5 authentication code to the new vauth directory

vauth: Moved the DIGEST authentication code to the new vauth directory

vauth: Moved the CRAM-MD5 authentication code to the new vauth directory

vauth: Moved the ClearText authentication code to the new vauth directory

vauth: Moved Curl_sasl_build_spn() to create the initial vauth source files