Memory leak in libcouchbase_create / libcouchbase_destroy (POC and patch included)

When the client calls libcouchbase_create and then later calls libcouchbase_destroy, some memory is leaked. For a client with many threads that open and close couchbase sessions, this will lead to memory exhaustion. The leak is caused by the use of strdup() in setup_boostrap_hosts(). These duplicated strings are not free'd in libcouchbase_destroy. The leak can be seen by using valgrind.

I have attached a proof of concept, and a patch with a proposed fix.

I have only tested on 1.0.2, but other versions may be affected.