slave_skip_errors in SHOW VARIABLES. (Bug #7800)


sql/structs.h:
  Add SHOW_SLAVE_SKIP_ERRORS
sql/set_var.cc:
  Add slave_compressed_protocol, slave_load_tmpdir, slave_skip_errors to list
  of variables.
mysql-test/t/rpl_variables.test:
  Add test for additional slave-related variables
mysql-test/r/rpl_variables.result:
  Update results
sql/sql_show.cc:
  Handle showing slave_skip_errors