Error was emitted when one tried to select information from view which used
merge algorithm and which also had CONVERT_TZ() function in its select list.

This bug was caused by wrong assumption that global table list for view
which is handled using merge algorithm begins from tables belonging to
the main select of this view. Nowadays the above assumption is not true only
when one uses convert_tz() function in view's select list, but in future
other cases may be added (for example we may support merging of views
with subqueries in select list one day). Relying on this false assumption
led to the usage of wrong table list for field lookups and therefor errors. 

With this fix we explicitly use pointer to the beginning of main select's
table list.


mysql-test/r/timezone_grant.result:
  Added additional test case for bug#15153 "CONVERT_TZ() is not allowed in
  all places in VIEWs" that checks that usage of CONVERT_TZ() function in view
  does not require additional privileges.
mysql-test/r/view.result:
  Added test case for bug#15153 "CONVERT_TZ() is not allowed in all places in 
  VIEWs".
mysql-test/t/timezone_grant.test:
  Added additional test case for bug#15153 "CONVERT_TZ() is not allowed in
  all places in VIEWs" that checks that usage of CONVERT_TZ() function in view
  does not require additional privileges.
mysql-test/t/view.test:
  Added test case for bug#15153 "CONVERT_TZ() is not allowed in all places in 
  VIEWs".
sql/sql_view.cc:
  mysql_make_view():
    We should not assume that global table list for view which is handled using
    merge algorithm begins from tables belonging to the main select of this
    view. Nowadays the above assumption is not true only when one uses
    convert_tz() function in view's select list, but in future other cases
    may be added (for example we may support merging of views with subqueries
    in select list one day). So let us instead explicitly use pointer to the
    beginning of main select's table list.