Changes

Fix uninitialized value in tls_create_object

On the first call to tls_create_object (stub.c), tls_fallback_ok is read
before being initialized. This patch initializes tls_fallback_ok to 0 in
upsteam_init (context.c)

Valgrind complains about the uninitialized value:
==14774== Conditional jump or move depends on uninitialised value(s)
==14774==    at 0x1528C3: tls_create_object (stub.c:900)
==14774==    by 0x1556AD: upstream_connect (stub.c:2065)
==14774==    by 0x15582E: upstream_find_for_transport (stub.c:2109)
==14774==    by 0x1558B7: upstream_find_for_netreq (stub.c:2130)
==14774==    by 0x156027: _getdns_submit_stub_request (stub.c:2296)
==14774==    by 0x1421C8: _getdns_submit_netreq (general.c:478)
==14774==    by 0x14261D: getdns_general_ns (general.c:636)
==14774==    by 0x142905: _getdns_general_loop (general.c:731)
==14774==    by 0x1432FB: getdns_general (general.c:888)
==14774==    by 0x118B94: incoming_request_handler (stubby.c:692)
==14774==    by 0x14F46B: udp_read_cb (server.c:762)
==14774==    by 0x15C86B: poll_read_cb (poll_eventloop.c:295)
==14774==  Uninitialised value was created by a heap allocation
==14774==    at 0x483877F: malloc (vg_replace_malloc.c:309)
==14774==    by 0x123CCF: upstreams_create (context.c:581)
==14774==    by 0x128B24: getdns_context_set_upstream_recursive_servers (context.c:2760)
==14774==    by 0x12DBFE: _getdns_context_config_setting (context.c:4646)
==14774==    by 0x12FF47: getdns_context_config (context.c:4769)
==14774==    by 0x1178C2: parse_config (stubby.c:297)
==14774==    by 0x117B24: parse_config_file (stubby.c:343)
==14774==    by 0x11919F: main (stubby.c:833)
 (commit: b804b8e)

Point stubby at my repo.
 (commit: 5721c50)

Sync tools shared with unbound
 (commit: f3a38e9)

Stub only links with GNUTLS

And valgrind check includes DoT session
 (commit: 3b5d1a9)

Dependencies for travis (+ testing...)
 (commit: f73bf0d)

Testing GNUTLS DoT tests
 (commit: f05c0ad)

Fix: mem leak with gnutls
 (commit: e17ed39)

Fix reporting authentication failure
 (commit: af46e20)

Update stubby.
 (commit: 3073d33)

Eliminate compile error
 (commit: 9c8b70e)

Name only authentication with GNUTLS
 (commit: e7d435e)

Run all tests again
 (commit: 6894159)

Revise recent lookup3.c update to restore building on Windows.

As we're now building with CMake, and CMake can supply endianness, just insist on using that.
 (commit: 822d8ad)

CMake libunbound fixups.

1. ub_ctx_set_stub is in unbound.h, not unbound-events.h.
2. Only bother looking for unbound event API if enabled.
3. If building stub only, ensure all libunbound items are off. This is necessary in case we first configure without stub only, and then change to stub only.

Fixes #463
 (commit: f01e718)

Work around dnsmasq issue
 (commit: ef45547)

Point ssl_dane submodule back at getdnsapi version.
 (commit: e96e334)

Update stubby.
 (commit: 252d68e)

Print GnuTLS debug messages
 (commit: c234865)

Relax GnuTLS priority strings slightly to allow getdns to work with TLS1.3 servers.

Now GnuTLS 3.6.5 and later are in the field, we've run into problems handshaking with TLS1.3 servers with a GnuTLS build. OpenSSL works fine. Comparing the client handshake of GnuTLS and OpenSSL, we found GnuTLS was being considerably more restrictive. This change loosens the restriction so GnuTLS presents nearly the same set of cipher and other options and OpenSSL. OpenSSL provides more signature algorithms. The change gets GetDNS working against Quad1, Quad8, Quad9 and the getdnsapi servers.
 (commit: 9baf655)

Fix DoT with GnuTLS >= 3.6
 (commit: 26a95b5)

Update Stubby to pick up latest Stubby release tag and Windows packaging details.
 (commit: be09306)

Issue #466: Memory leak with retrying queries

(for examples with search paths).
Thanks doublez13.
 (commit: 3c6756d)