proxy control does not verify existance of sasl-regex resulting dn (ITS#2965)

[igor@ipass.net]

Full_Name: Igor Brezac
Version: OPENLDAP_REL_ENG_2_1
OS: Solaris 9
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (209.170.142.3)


Consider the following example:

$ ldapwhoami -U igor -e '!authzid=u:adfasd'
SASL/DIGEST-MD5 authentication started
Please enter your password: 
SASL username: igor
SASL SSF: 128
SASL installing layers
dn:cn=adfasd,ou=people,o=pb

Where cn=adfasd,ou=people,o=pb does not exist and adfasd is a not a valid id.