Description of problem:
When trying to register a system to satellite with a user that uses PAM LDAP for
authentication rhn_reg and up2date --register fails.  

Version-Release number of selected component (if applicable):
I have experienced this behavior on both Sat 4.20 and 4.15.

How reproducible:
yes

Steps to Reproduce:
1.Configure the sat to use PAM LDAP AUTH: 
 -add pam_auth_service = rhn-satellite to /etc/rhn/rhn.conf
 -create a /etc/pam.d/rhn-satellite file:
  	#%PAM-1.0
	auth required /lib/security/pam_env.so	
	auth sufficient /lib/security/pam_ldap.so no_user_check
	auth required /lib/security/pam_deny.so
	account required /lib/security/pam_ldap.so no_user_check
 -edit /etc/ldap.cong to talk to your ldap server

2. Create a user on the satellite and check use PAM auth

3. Run rhn_register form a client machine and use the ldap user you just created
  
Actual results:
rhn_register crashes machien does not register


Expected results:
machine registers

Additional info: