wk2: account management tooling

target/pam/pam.d/smtp

@@ -0,0 +1,4 @@
+# /etc/pam.d/smtp
+auth        required    pam_pgsql.so
+account     required    pam_pgsql.so
+password    required    pam_pgsql.so

target/pam/pam_pgsql.conf

@@ -0,0 +1,12 @@
+# /etc/pam_pgsql.conf
+database = mails
+host = localhost
+user = mailreader
+password = mailreader-secret
+table = users
+user_column = userid
+pwd_column = password
+#expired_column = acc_expired
+#newtok_column = acc_new_pwreq
+pw_type = crypt
+#debug