ssh: unicode adaptions
Fix mkdir race

Creating examples/code and examples/dict in parallel can fail when
examples doesn't exists. This has been seen on FreeBSD.
Merge branch 'anders/diameter/mkdir_race/OTP-11051' into maint

* anders/diameter/mkdir_race/OTP-11051:
  Fix mkdir race
Merge branch 'fredrik/ssh/unicode_adapt' into maint

* fredrik/ssh/unicode_adapt:
  ssh: unicode adaptions