rosa svn-*: notify and verify users

LDAP and Unix password user tools.
Improve diagnostics.

rosa svn-pre-commit: verify users in owner and access-list
rosa svn-post-commit: notify users in owner and access-list on changes
rosa svn-pre-commit: use simple split
Merge pull request #1278 from matthewrmshin/rosa-svn-ldap

rosa svn-*: notify and verify users