[VALGRIND] Solve C++ issues detected via Valgrind

[sergiobarra]

Some issues are detected when running Komondor simulations with Valgrind. Try to solve them and/or detect their impact.

• [ ] Invalid writes
• [ ] Invalid reads
• [ ] Conditional jumps
• [ ] Use of uninitialize
• [ ] Others

[sergiobarra]

Do it again for new version with slotted backoff.