Signed-off-by: A. Jesse Jiryu Davis <jesse@mongodb.com>

Single-threaded clients had not re-checked the server certificate after
a disconnect.

Conflicts:
	src/mongoc/mongoc-cluster.c
	tests/test-mongoc-client.c

Signed-off-by: A. Jesse Jiryu Davis <jesse@mongodb.com>

Also fix logic for setting maintainer_flags_default.

Signed-off-by: A. Jesse Jiryu Davis <jesse@mongodb.com>

Remove redundant install instructions from README and combine all instructions
in installing.page. Improve the instructions (CDRIVER-722) especially for Open
SSL on El Capitan (CDRIVER-941).

Beginning in version 1.2, once a pool or client has any SSL options
set, all connections use SSL, even if "ssl=true" is omitted from the
MongoDB URI. Before, SSL options were ignored unless "ssl=true" was
included in the URI.

In 1.1.x, all clients (pooled and single-threaded) required an SSL
connection to the server only if "ssl=true" was in the URI. In 1.2.0
this changed unintentionally (but beneficially) for single-threaded
clients: setting a single-threaded client's SSL options put the client
in SSL mode, even if "ssl=true" is omitted from the URI.

Pooled clients, however, stopped working entirely if the options are
set but "ssl=true" is omitted. This patch fixes pooled clients and
tests the new behavior for both.

Clear any previous MongoDB installation.

Avoid SERVER-21079: skip /BulkOperation/large_inserts_ordered test if
the server is a 3.2 release candidate.

Introduce helpers to skip tests based on server version in general.

Occasional spurious failures on slow build VMs.

Must destroy cursor before destroying client, not after.

And don't support TCP in general =)

Although ETIMEDOUT is defined in certain cases, it doesn't necessarily
contain the same value as WSAETIMEDOUT.

Although the previous commit removes the need for this, it's a bug
waiting to happen again: if a stream is wrapped in more than one
layer it can't be passed to mongoc_stream_poll. Now, we unwrap until
we reach the real base stream before calling poll.

Not needed: mongoc_cluster_fetch_stream_pooled ultimately calls
mongoc_client_default_stream_initiator, hence mongoc_client_connect_tcp,
which awaits connectTimeoutMS for the connection to be established.

Calling mongoc_stream_wait in pooled mode with SSL failed with EINVAL:
"stream" is a socket stream, wrapped in a TLS stream, wrapped in a
buffered stream. You can pass a socket stream or TLS stream to
mongoc_stream_poll, but you can't pass a buffered stream since a
buffered stream doesn't implement poll().

Copied from the server repo. Not all are yet used in tests.