Removed the support for renaming SPs. It's non-standard, conflicted with a standard
syntax, and was a bit broken anyway.


mysql-test/r/sp-error.result:
  Removed test for renaming procedures with alter.
mysql-test/r/sp.result:
  Removed test for renaming procedures with alter.
mysql-test/t/sp-error.test:
  Removed test for renaming procedures with alter.
mysql-test/t/sp.test:
  Removed test for renaming procedures with alter.
sql/sp.cc:
  Removed support for renaming SPs. It's non-standard, conflicted with a standard
  syntax, and was a bit broken anyway.
sql/sp.h:
  Removed support for renaming SPs. It's non-standard, conflicted with a standard
  syntax, and was a bit broken anyway.
sql/sql_parse.cc:
  Removed support for renaming SPs. It's non-standard, conflicted with a standard
  syntax, and was a bit broken anyway.
sql/sql_yacc.yy:
  Removed support for renaming SPs. It's non-standard, conflicted with a standard
  syntax, and was a bit broken anyway.