methods: https: handle requests for TLS re-handshake

When accessing repository protected by TLS mutual auth, apt may receive
a "re-handshake" request from the server, which must be handled
in order for download to proceed.

This situation arises when the server requests a client certificate
based on the resource path provided in the GET request, after the inital
handshake in UnwrapTLS() has already occurred, and a secure connection
has been established.

This issue has been observed with Artifactory-backed Debian repository.

To address the issue, split TLS handshake code out into its own method
in TlsFd, and call it when GNUTLS_E_REHANDSHAKE error is received.

Signed-off-by: Michael Zhivich <mzhivich@akamai.com>

(merged from Debian/apt#93)

LP: #1829861

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