Chained Termination on Constraints Violation Fixed and Optimized

Features & Optimizations

• Threshold added on group vmem limit exceeding to reduce the number of reschedulings before the workers reduction and speedup heavy-loaded usecases
• Execution on the pure Python2 / PyPy without any dependences allowed, warnings are shown about the disabled functionality (vmlimit without psutils)

Fixes

• Termination of the chained jobs from the violating origin is fixed to not restart or postpone such jobs (even when they are already terminating with the restart flag)
• Logging to the implicit base directories fixed (filename without: "./" or full path specification)

Known Bugs

• Jobs rescheduling with _CHAINED_CONSTRAINTS kills related jobs that have ontimeout flag and assumed to be restarted (should not been terminated at all)