Bug #21331 Instance Manager: Connect problems in tests

Description:
This symptom is known since (at least) 5.0.21, but it seems it was not yet reported.

Happens on different platforms in different tests - this is from 5.0.24:

=====
im_daemon_life_cycle           [ fail ]

Errors are (from /PATH/mysqltest-time) :
mysqltest: In included file "./include/im_check_os.inc": At line 1: Could not open connection 'dflt_server_con': 1049 Unknown database 'mysql'
(the last lines may be the most important ones)

Killing Possible Leftover Processes
=====
sol9x86-5.0-max.log   NDB

=====
im_options_unset               [ fail ]

Errors are (from /PATH/mysqltest-time) :
mysqltest: In included file "./include/im_check_os.inc": At line 1: Could not open connection 'dflt_server_con': 1049 Unknown database 'mysql'
(the last lines may be the most important ones)

Killing Possible Leftover Processes
=====
intelxeon3-5.0-standard.log   normal

In previous builds, also in other "IM" tests on other platforms:
5.0.21:
im_daemon_life_cycle    hpita2-64bit-5.0-max.log   NDB
                        pegasos3-glibc23-5.0-max.log   NDB

5.0.22:
im_daemon_life_cycle    granny-5.0-max.log   NDB
                        hpita2-64bit-5.0-max.log   NDB
                        sol9x86-5.0-cluster.log   NDB
                        sol9x86-5.0-max.log   NDB
im_options_set          granny-5.0-max.log   normal

5.0.23:
im_options_unset        hpita2-64bit-5.0-pro.log   normal
im_utils                hp3750-64bit-5.0-debug.log   normal

5.0.24 test build:
im_options_unset        hpita2-64bit-5.0-pro.log   normal
                        hpita2-64bit-5.0-standard.log   normal
im_utils                hpita2-64bit-5.0-pro.log   normal

How to repeat:
Occurred during the test suite.

A patch for this bug has been committed. After review, it may
be pushed to the relevant source trees for release in the next
version. You can access the patch from:

  http://lists.mysql.com/commits/10951

ChangeSet@1.2246, 2006-08-28 23:08:42+04:00, anozdrin@alik. +15 -0
  Preliminary patch for the following bugs:
    - BUG#15934: Instance manager fails to work;
    - BUG#18020: IM connect problem;
    - BUG#18027: IM: Server_ID differs;
    - BUG#18033: IM: Server_ID not reported;
    - BUG#21331: Instance Manager: Connect problems in tests;
  
  The only test suite has been changed
  (server codebase has not been modified).

Kent looked at the patch and okayed it (on IRC)

A patch for this bug has been committed. After review, it may
be pushed to the relevant source trees for release in the next
version. You can access the patch from:

  http://lists.mysql.com/commits/10998

ChangeSet@1.2247, 2006-08-29 15:46:40+04:00, anozdrin@alik. +16 -0
  Preliminary patch for the following bugs:
    - BUG#15934: Instance manager fails to work;
    - BUG#18020: IM connect problem;
    - BUG#18027: IM: Server_ID differs;
    - BUG#18033: IM: Server_ID not reported;
    - BUG#21331: Instance Manager: Connect problems in tests;
  
  The only test suite has been changed
  (server codebase has not been modified).

Pushed into 5.0-rt tree.

Merged into 5.0 tree, currently tagged 5.0.25;
merged into 5.1 tree, currently tagged 5.1.12-beta.

Test suite change. No changelog entry needed.