erl_interface: Remove superfluous comma in enum erlang_char_encoding
[test_server] Remove unused code related to remote targets

After removing the functionality for remote target nodes in R16A,
there was still some unused code left and some documentation that was
not updated. This is now completed.
Fixed rekeying initiation and secured testcase
Merge branch 'sverk/erl_interface-trailing-enum-comma' into maint-r16

* sverk/erl_interface-trailing-enum-comma:
  erl_interface: Remove superfluous comma in enum erlang_char_encoding
Merge branch 'fredrik/ssh/fix-rekeying/OTP-10911' into maint-r16

* fredrik/ssh/fix-rekeying/OTP-10911:
  Fixed rekeying initiation and secured testcase
Prepare release
Fixed appup for 2.1.5
ssh: Test and enhance handling of nonexistent subsystem
ssh: Prepare for upcoming release

Note: If more things are added before the next releas the
appup will need more updates.
Merge branch 'sverk/erl_interface-trailing-enum-comma' into maint-r16

* sverk/erl_interface-trailing-enum-comma:
  erl_interface: Remove superfluous comma in enum erlang_char_encoding
Merge branch 'ia/ssh/errorhandling-nonexisting-subsystem/OTP-10714' into maint-r16

* ia/ssh/errorhandling-nonexisting-subsystem/OTP-10714:
  ssh: Prepare for upcoming release
  ssh: Test and enhance handling of nonexistent subsystem
  Prepare release
  Fixed rekeying initiation and secured testcase
Merge branch 'fredrik/ssh/fix-rekeying/OTP-10911' into maint-r16

* fredrik/ssh/fix-rekeying/OTP-10911:
  Fixed appup for 2.1.5

Conflicts:
	lib/ssh/src/ssh.appup.src
Delete obsolete note about simple-one-for-one supervisor

Since commit 47759479146ca11ad81eca0bb3236b265e20601d,
simple-one-for-one supervisors _do_ kill their children explicitly on
shutdown.  That commit also removed this note, but it seems like the
merge commit 45b4d5309e0686cc5fa28506de76f75b598bbd95 incorrectly
reinstated it.
Update a comment
Use correct type name
Add type info for hipe_bifs:nstack_used_size/0
Use remote type instead of relying on hipe_icode.hrl
Enable more warnings
Take out 'constant' type test from left over comments
Take out 'constant' type test and unnecessary type declaration