Consistent error return code for not authorized user

[cfgamboa]

Dear all,

on 11.2.3 dCache, return codes for client seem no to be consistent across protocols.
For example, if the cgamboa is a username currently included in the ban file.

When using ROOT (gfal-ls error: 52 (Invalid exchange) - Failed to stat file (Invalid exchange) may need to be improved of be consistent with the one given by using DAVS

[cgamboa@spool0104 ~]$ gfal-ls root://dcint-door002.sdcc.bnl.gov/pnfs/usatlas.bnl.gov/cgamboa/
gfal-ls error: 52 (Invalid exchange) - Failed to stat file (Invalid exchange)

[cgamboa@spool0104 ~]$gfal-copy -f /etc/services roots://dcint-door002.sdcc.bnl.gov/pnfs/usatlas.bnl.gov/cgamboa/test.1
Copying file:///etc/services   [FAILED]  after 0s                                                                                                                                                                                                               
gfal-copy error: 52 (Invalid exchange) - Error on XrdCl::CopyProcess::Run(): [FATAL] Auth failed: No protocols left to try (destination)

When using DAVS

[cgamboa@spool0104 ~]$ gfal-ls davs://dcint-door002.sdcc.bnl.gov/pnfs/usatlas.bnl.gov/cgamboa/test.1
gfal-ls error: 13 (Permission denied) - Result HTTP 401 : Authentication Error  after 1 attempts

[cgamboa@spool0104 ~]$ gfal-copy -f davs://dcint-door002.sdcc.bnl.gov/pnfs/usatlas.bnl.gov/cgamboa/test.1 /dev/null
gfal-copy error: 13 (Permission denied) - Could not stat the source: Result HTTP 401 : Authentication Error  after 1 attempts

Testing a ban user (cgamboa)

[dcint-core001] (local) admin > \s gPlazma@* explain login username:cgamboa
gPlazma@dcint-frontend001Domain:
    LOGIN FAIL
     |    in: UserNamePrincipal[cgamboa]
     |
     +--AUTH OK
     |   |
     |   +--x509 OPTIONAL:FAIL (no X.509 certificate chain) => OK
     |   |
     |   +--voms OPTIONAL:FAIL (no X509 certificate chain) => OK
     |   |
     |   +--oidc OPTIONAL:FAIL (No bearer token in the credentials) => OK
     |
     +--MAP OK
     |   |    added: GidPrincipal[31152,primary]
     |   |           UidPrincipal[9102]
     |   |
     |   +--gridmap OPTIONAL:OK => OK
     |   |
     |   +--vorolemap OPTIONAL:FAIL (no record) => OK
     |   |
     |   +--authzdb SUFFICIENT:OK => OK (ends the phase)
     |          added: GidPrincipal[31152,primary]
     |                 UidPrincipal[9102]
     |
     +--ACCOUNT FAIL
     |   |
     |   +--banfile REQUISITE:FAIL (user banned) => FAIL (ends the phase)
     |