* create base class for dash-specific tests
* use common base class in p2p-autoinstantsend.py
* use common base class in p2p-instantsend.py
* rename check_IX_lock to wait_for_instantlock
* fix issue with trx amounts precision in autoix-mempool.py
* fix issue with trx amounts precision in p2p-autoinstantsend.py
* fix issue with trx amounts precision in p2p-instantsend.py
* Rallback adding empty line
* Rallback adding empty line