High-load testing of NSM with new fixes

[NikitaSkrynnik]

Description

We need to test NSM v1.13.1-rc.1 for memory leaks with these fixes:

1. Correctly manage the life cycle of FD files on the recvfd client side #1628
2. use a quick fix for grpcfd #1631

Tasks

Task	Time	Done
Build images	1h
High-load testing	7h
Check results	2h

[denis-tingaikin]

Is this done or it's still TODO?

[denis-tingaikin]

Fixed by edwarnicke/grpcfd#30 and #1616