Closes gh-645 - Invalid error message in box.net.box
Fixes gh-636 - Flush schema in box.net.box

Added method remote:reload_schema()
Add libssl.so.10 to digest.lua
Merge branch 'stable' of github.com:tarantool/tarantool into stable
Code review fixes
Merge branch 'master' of github.com:tarantool/tarantool
Merge remote-tracking branch 'origin/stable'
Add more test coverage for roles.

Test revoke a privilege from a role using a different grant path.
Merge branch 'master' of github.com:tarantool/tarantool