CDRIVER-1330 remove automatic init/cleanup

[kevinAlbs]

Removes deprecated behavior enabled by ENABLE_AUTOMATIC_INIT_AND_CLEANUP.

To help users identify a missing call to mongoc_init a check is added in the construction of mongoc_client_t and mongoc_client_pool_t to return an error if mongoc_init was not called. For example:

// mongoc_init() was not called previously!
mongoc_client_t *client = mongoc_client_new_from_uri_with_error (uri, &error);
if (!client) {
    fprintf (stderr, "error creating client: %s\n", error.message);
    return EXIT_FAILURE;
}

Before the check, an assert fails:

./cmake-build/src/libmongoc/example-client       
/Users/kevin.albertson/code/tasks/mongo-c-driver-2.0/src/libmongoc/src/mongoc/mongoc-handshake.c:709 _mongoc_handshake_freeze(): assertion failed: pthread_mutex_lock (&(&gHandshakeLock)->wrapped_mutex) == 0

With the check, this becomes:

error creating client: Attempting to create client, but libmongoc not initialized. Call mongoc_init

[vector-of-bool]

Yay!