.gitmodules: ignoring changes in rocksdb submodule

Signed-off-by: Federico Gimenez <fgimenez@coit.es>
ECTransaction: Remove unused typedef.

Signed-off-by: Jianpeng Ma <jianpeng.ma@intel.com>
Merge pull request #2791 from majianpeng/fix1

ECTransaction: Remove unused typedef.

Reviewed-by: Sage Weil <sage@redhat.com>
Merge pull request #2790 from fgimenez/git-ignore-src-rocksdb

.gitmodules: ignoring changes in rocksdb submodule