tests/stress: Add test to create a dict beyond "maximum" rehash size.
tests/stress: Add test to create a dict beyond "maximum" rehash size.

There is a finite list of ascending primes used for the size of a hash
table, and this test tests that the code can handle a dict larger than the
maximum value in that list of primes.  Adding this tests gets py/map.c to
100% coverage.

pramasoul/micropython,selste/micropython,kerneltask/micropython,tobbad/micropython,dmazzella/micropython,bvernoux/micropython,pfalcon/micropython,tobbad/micropython,ryannathans/micropython,swegener/micropython,pozetroninc/micropython,bvernoux/micropython,ryannathans/micropython,adafruit/micropython,adafruit/micropython,pramasoul/micropython,selste/micropython,adafruit/circuitpython,henriknelson/micropython,pramasoul/micropython,adafruit/micropython,adafruit/circuitpython,dmazzella/micropython,selste/micropython,kerneltask/micropython,tralamazza/micropython,pfalcon/micropython,MrSurly/micropython,henriknelson/micropython,MrSurly/micropython,tobbad/micropython,swegener/micropython,selste/micropython,trezor/micropython,ryannathans/micropython,henriknelson/micropython,pozetroninc/micropython,ryannathans/micropython,adafruit/circuitpython,dmazzella/micropython,pramasoul/micropython,selste/micropython,adafruit/micropython,MrSurly/micropython,dmazzella/micropython,henriknelson/micropython,pfalcon/micropython,pfalcon/micropython,adafruit/circuitpython,pozetroninc/micropython,MrSurly/micropython,bvernoux/micropython,trezor/micropython,trezor/micropython,kerneltask/micropython,bvernoux/micropython,henriknelson/micropython,pramasoul/micropython,tralamazza/micropython,adafruit/circuitpython,adafruit/micropython,tobbad/micropython,bvernoux/micropython,trezor/micropython,pozetroninc/micropython,pozetroninc/micropython,swegener/micropython,kerneltask/micropython,tralamazza/micropython,trezor/micropython,ryannathans/micropython,adafruit/circuitpython,swegener/micropython,kerneltask/micropython,swegener/micropython,MrSurly/micropython,pfalcon/micropython,tobbad/micropython,tralamazza/micropython