Improve log information in case of errors

[Holger Schimanski]

In one situation there was an error in the plugin and the log information about the error was quite generic.

The error message in the log files was only ERROR: (...) Group not assigned to project role for project

This log information should be improved to be more specific for the error.

[Holger Schimanski]

Log message improved with more details

log.error("Group " + group.getName() + " not assigned to project role " + role.getName() + " for project " + project.getKey());

[Holger Schimanski]

Added also debug information for detecting the relevant project roles of a project

log.debug("Permission scheme " + tmpPermissionScheme.getName() + " detected for project " + tmpProject.getKey());

log.debug("Project role " + tmpRole.getName() + " detected for " + tmpPermissionScheme.getName());

[Holger Schimanski]

Also added debug information for groups and users detected for a project role for a project

log.debug("Group " + group.getName() + " detected for project role " + tmpProjectRole.getName() + " for project " + tmpProject.getKey());

log.debug("User " + tmpRoleUser.getName() + " detected for project role " + tmpProjectRole.getName() + " for project " + tmpProject.getKey());

[Holger Schimanski]

Released as version 2.6.2