Portability fixes

Fixed test suite for HPUX 10.20 and MacOSX


Build-tools/Do-compile:
  Added timeout to mysqladmin shutdown commands
  Kill old running mysqld started by earlier runs
  Removed run time warning from LD_LIBRARY_PATH
client/mysqladmin.c:
  Return 1 if pid file isn't deleted on shutdown.
  Fix error message if pid file is not deleted
client/mysqltest.c:
  Always allow --debug flag
  (Makes it easier to run mysql-test-run)
mysql-test/mysql-test-run.sh:
  A lot of safety fixes. 
  This fixes some problems with test suite for HPUX 10.20 and MacOSX
sql-bench/bench-init.pl.sh:
  Allow tests to change time limit.
sql-bench/crash-me.sh:
  Indentation cleanups
  Added DROP for a created table
sql-bench/test-alter-table.sh:
  Added default time limit
  Changed test to be estimated to get down run time.
  Fixed that add_multi_col is detected
sql-bench/test-insert.sh:
  Comment cleanup
sql/mysql_priv.h:
  Removed not needed prototype.
sql/mysqld.cc:
  Removed DBUG warnings
  Removed default argument for clean_up() and made it static.
  More comments.
  Ignore SIGHUP during shutdown
sql/net_pkg.cc:
  More comments
sql/slave.cc:
  Added DBUG_PRINT messages

sql-bench/test-insert.sh

@@ -21,10 +21,11 @@
 # $opt_loop_count rows in random order
 #
 # changes made for Oracle compatibility
-# - $limits{'func_odbc_mod'} is OK from crash-me, but it fails here so set we
+# - $limits->{'func_odbc_mod'} is OK from crash-me, but it fails here so set we
 #   set it to 0 in server-cfg
-# - the default server config runs out of rollback segments, so I added a couple
-#   of disconnect/connects to reset
+# - the default server config runs out of rollback segments, so we added a
+#   couple of disconnect/connects to reset
+#
 ##################### Standard benchmark inits ##############################
 
 use DBI;