Added 'const' to arguments in get_one_option and find_typeset()

One should not change the program arguments!
This change also reduces warnings from the icc compiler.

Almost all changes are just syntax changes (adding const to
'get_one_option function' declarations).

Other changes:
- Added a few cast of 'argument' from 'const char*' to 'char *'. This
  was mainly in calls to 'external' functions we don't have control of.
- Ensure that all reset of 'password command line argument' are similar.
  (In almost all cases it was just adding a comment and a cast)
- In mysqlbinlog.cc and mysqld.cc there was a few cases that changed
  the command line argument. These places where changed to instead allocate
  the option in a MEM_ROOT to avoid changing the argument. Some of this
  code was changed to ensure that different programs did parsing the
  same way. Added a test case for the changes in mysqlbinlog.cc
- Changed a few variables that took their value from command line options
  from 'char *' to 'const char *'.

1 files changed, 1 insertions, 1 deletions

diff --git a/include/my_getopt.h b/include/my_getopt.h
index 642fb344d92..ffff706e015 100644
--- a/include/my_getopt.h
+++ b/include/my_getopt.h
@@ -89,7 +89,7 @@ struct my_option
   void       *app_type;                 /**< To be used by an application */
 };
 
-typedef my_bool (*my_get_one_option)(const struct my_option *, char *, const char *);
+typedef my_bool (*my_get_one_option)(const struct my_option *, const char *, const char *);
 
 /**
   Used to retrieve a reference to the object (variable) that holds the value