Avoid timing issue in schema transaction when node is stopping

By doing an abort, the create_table can be restarted
if a node go down during the transaction.

{badarg,
   [{erlang,link,[undefined],[]},
    {mnesia_controller,
        wait_for_schema_commit_lock,0,
	       [{file,"mnesia_controller.erl"},
         {line,303}]},
    {mnesia_schema,prepare_commit,3,
        [{file,"mnesia_schema.erl"},
         {line,1838}]},
    {mnesia_tm,commit_participant,6,
        [{file,"mnesia_tm.erl"},
         {line,1669}]}]}}},
Merge branch 'dgud/mnesia/create-table-race/OTP-12124' into maint-17

* dgud/mnesia/create-table-race/OTP-12124:
  Avoid timing issue in schema transaction when node is stopping
Prepare release
Updated OTP version
Merge branch 'maint-17' into maint

Conflicts:
	OTP_VERSION
Merge branch 'maint'