Add a mechanism to log private data from exceptions and use case for bind_variables.
In an external reparent, if the old master doesn't convert
to spare by itself, instead of scrapping it, we'll make it spare now.
Test to ensure bind_vars are not part of exception.
Merge branch 'vtclient' of github.com:youtube/vitess into vtclient
Fixed test breakage.
Merge pull request #132 from youtube/vtclient

Test to ensure bind_vars are not part of exception.
Merge pull request #131 from youtube/replication

In an external reparent, if the old master doesn't convert