phosphor: pam: Fix credits to maintain minlen req

Default credit for pam-cracklib was used, causing issue
in meeting minlen requirement for new password. i.e. 1 credit
will be applied if the password containts, digits, upper case,
or lower case etc, making minlen to be accepted. "fw6ev9" will
pass pam_cracklib earlier for minlen as password length was 6, +2
credit got substitued for lower case & digits use in the password.
Correcting the same now, by not providing any credit, and so the
minlen of 8 chars in the password must be met.

Tested
1. Tested password 'fw6ev9' fails to set
2. Tested password '0penBmc1' was accepted as it passes 8 character

Note: With this commit, the current default passwd for root user
'0penBmc' will work fine, but the same can't be used as password
during password update.

(From meta-phosphor rev: 0e67cd66f4f530b4ccccb2ab400ba2dabb3c0737)

Change-Id: Ieeebef45a655563ac7779627b1cf38ef6080c046
Signed-off-by: Richard Marian Thomaiyar <richard.marian.thomaiyar@linux.intel.com>
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-phosphor/recipes-extended/pam/libpam/pam.d/common-password b/meta-phosphor/recipes-extended/pam/libpam/pam.d/common-password
index f0f0518..cf6a62a 100644
--- a/meta-phosphor/recipes-extended/pam/libpam/pam.d/common-password
+++ b/meta-phosphor/recipes-extended/pam/libpam/pam.d/common-password
@@ -17,7 +17,7 @@
 
 # here are the per-package modules (the "Primary" block)
 password	[success=ok default=die]	pam_ipmicheck.so spec_grp_name=ipmi
-password	[success=ok default=die]	pam_cracklib.so debug enforce_for_root reject_username minlen=8 difok=0 use_authtok
+password	[success=ok default=die]	pam_cracklib.so debug enforce_for_root reject_username minlen=8 difok=0 lcredit=0 ocredit=0 dcredit=0 ucredit=0 use_authtok
 password	[success=ok ignore=ignore default=die]	pam_pwhistory.so debug enforce_for_root remember=0 use_authtok
 password	[success=ok default=die]	pam_unix.so sha512 use_authtok
 password	[success=1 default=die] 	pam_ipmisave.so spec_grp_name=ipmi spec_pass_file=/etc/ipmi_pass key_file=/etc/key_file