[PATCH] Invoke 'store password' prompt for all commands requiring authentication

Log:
 While working on a wc of a repo which needs authentication, 'store
 password unencrypted' prompt is getting invoked only for those svn
 commands that access the repo URL or that have an URL as argument
 (eg. svn ls http://localhost/repo) and not for wc oriented commands
 such as `svn ls' or `svn cat -r 5 test.c' which also require
 authentication. The prompt gets invoked for the rest of the commands
 which need repo access, with the following patch.

 * subversion/libsvn_ra_neon/session.c
  (svn_ra_neon__get_repos_root) : Call
  `svn_ra_neon__maybe_store_auth_info' to invoke 'store
   password unencrypted' prompt.

 Patch by : Kannan R <kannanr_at_collab.net>

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