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, 2 insertions, 2 deletions

diff --git a/unittest/mysys/my_getopt-t.c b/unittest/mysys/my_getopt-t.c
index fb0922b88f8..4b50468ac3f 100644
--- a/unittest/mysys/my_getopt-t.c
+++ b/unittest/mysys/my_getopt-t.c
@@ -61,7 +61,7 @@ static struct my_option mopts_options[]=
 };
 
 my_bool dummy_get_one_option(const struct my_option *opt __attribute__((unused)),
-                             char *argument __attribute__((unused)),
+                             const char *argument __attribute__((unused)),
                              const char *filename __attribute__((unused)))
 {
   return FALSE;
@@ -235,7 +235,7 @@ static struct my_option auto_options[]=
 
 
 my_bool auto_get_one_option(const struct my_option *opt,
-                            char *argument,
+                            const char *argument,
                             const char *filename __attribute__((unused)))
 {
   if (argument == autoset_my_option)