refactor testSRBank and create new class NdbMixRestarter


storage/ndb/test/ndbapi/testSRBank.cpp:
  refactor testSRBank and create new class NdbMixRestarter
storage/ndb/test/src/Makefile.am:
  refactor testSRBank and create new class NdbMixRestarter
storage/ndb/test/src/NDBT_Test.cpp:
  fix
storage/ndb/test/include/NdbMixRestarter.hpp:
  New BitKeeper file ``storage/ndb/test/include/NdbMixRestarter.hpp''
storage/ndb/test/src/NdbMixRestarter.cpp:
  New BitKeeper file ``storage/ndb/test/src/NdbMixRestarter.cpp''