Use REVA lock api

[diocas]

Instead of our current implementation. Also, double check for reliability, as the current implementation some times works, others throws errors.

[mateusz-garlacz]

I played a bit with the locks, I'd like to write a summary:

• the solution proposal we discussed, as I understood, was to have configurable classes that would implement locking, e.g. one using our current solution, one using cs3apis
• as I mentioned the cs3 locks seem not to be implemented for every driver - they don't work on local environment. This impedes development. I asked a question here Locks implementation cs3org/reva#3183. (maybe @gmgigi96 knows how to overcome this?)
• the locks would not be cross-compatible, are there use cases where two users could use different implementations?
• does it make sense to keep >1 implementations, i.e. who could be the final user of the current solution?

@diocas