When creating a BDB txn the automatic setting of svn:date should occur earlier so that it is not recorded as an explict setting.
When creating a BDB txn the automatic setting of svn:date should
occur earlier so that it is not recorded as an explict setting.

* subversion/libsvn_fs_base/revs-txns.c
  (txn_body_begin_txn): Move svn:date to here from ...
  (svn_fs_base__begin_txn): ... here.
 
Found by: <evgeny.kotkov@visualsvn.com> 


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1663697 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion