[column families] Get rid of VersionSet::current_ and keep current Version for each column family
Summary: The biggest change here is getting rid of current_ Version and adding a column_family_data->current Version to each column family. I have also fixed some smaller things in VersionSet that made it easier to implement Column family support. Test Plan: make check Reviewers: dhruba, haobo CC: leveldb Differential Revision: https://reviews.facebook.net/D15105
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