Add error logging to 
org.apache.sshd.server.jaas.JaasPasswordAuthenticator.authenticate()
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                 Key: SSHD-102
                 URL: https://issues.apache.org/jira/browse/SSHD-102
             Project: MINA SSHD
          Issue Type: Improvement
    Affects Versions: 0.5.0, 0.4.0
         Environment: sshd JAAS used with LDAP based authentication.

            Reporter: Torsten Mielke


The JaasPasswordAuthenticator.authenticate() method currently silently ignores 
any exceptions being raised and simply returns false in case of any 
authentication erorrs. 
In environments where sshd is used in other frameworks like OSGi, it becomes 
very difficult to trouble shoot the reasons for the authentication failure. 
Rather than simply returning false, I propose to print a logging statement at 
the least.

    catch (Exception e) {
            log.error("Authentication failed with " + 
                      e.getMessage() + 
                      "cause: " + 
                      e.getCause() );
            return false;
    }



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