Add support for non-root paths in API URLs.

Currently osc supports API URLs without path only,
like https://api.example.com (if there is pathname, it's just ignored).
With this change API URLS with path, like https://example.com/api
are supported correctly.

This is useful for those who can't have OBS api, webui and main site
on different domains and buy separate X.509 certificates for them,
or just can't afford to have separate IP addresses for them
(please note that currently osc doesn't support TLS SNI).

Signed-off-by: Oleg Girko <ol@infoserver.lv>
Add support for TLS SNI if M2Crypto supports it.

Currently osc can't access API URLs which share the same IP address
with other SSL-enabled sites, complaining about certificate
not matching hostname.

This change solves this problem by instructing M2Crypto.SSL.Connection
to send the desired hostname to https server using TLS SNI extension,
thus allowing the server to present the right certificate and choose
the right virtual site.

This is useful for those who can't afford to have a separate IP address
for OBS API.

For TLS SNI to work correctly, M2Crypto should be patched:
https://bugzilla.osafoundation.org/show_bug.cgi?id=13073
For unpatched M2Crypto osc degrades to operation without TLS SNI.

Signed-off-by: Oleg Girko <ol@infoserver.lv>