Relevant BUGIDs:

Relevant BUGIDs:

Purpose of commit: refactorization

Commit summary:
---------------
        * modules/pam_unix/pam_unix_acct.c (pam_sm_acct_mgmt): Call
        get_account_info() and check_shadow_expiry().
        * modules/pam_unix/passverify.c: Add get_account_info() to
        obtain shadow and passwd entry. Add check_shadow_expiry() to
        for shadow password expiry check.
        (get_pwd_hash): Call get_account_info().
        * modules/pam_unix/passverify.h: Add prototypes for get_account_info()
        and check_shadow_expiry().