issues with user management in rasmgr

[Dimitar Misev]

There are several issues with user management in rasmgr which need to be addressed (relevant ​docs).

In particular when creating a new user or changing user attributes:

1. if a new password is set which contains special caracters (e.g. # or / or %), this leads to unexpected behavior and completely seems to mess up rasdaman.
   • it would be good to fix it so that passwords can support such special characters
   • but if it's not possible then we need validation when entering a password that it contains only valid characters
2. if no -rights option is specified then all rights from the user are removed. This is dangerous and unexpected behavior: not specifying the -rights option should not change the user rights.

Note when testing, you can reset the users by removing /opt/rasdaman/etc/rasmgr.auth

In rasdaman the source code of rasmgr can be found in rasmgr/