Fix password setting for rhel5.

Changing password via 'chpasswd' command in rhel5 would fail, if input
to the 'chpasswd' command doesn't end with '\n'.  The fix is just to
append a carriage return to the input.

ChangeLog

@@ -5,6 +5,8 @@
    'initctl reload-configuration' (LP: #1124384).  If so, then invoke it.
  - add Azure datasource.
  - add support for SuSE / SLES [Juerg Haefliger]
+ - add a trailing carriage return to chpasswd input, which reportedly
+   caused a problem on rhel5 if missing.
 0.7.2:
  - add a debian watch file
  - add 'sudo' entry to ubuntu's default user (LP: #1080717)

cloudinit/config/cc_set_passwords.py

@@ -75,7 +75,7 @@ def handle(_name, cfg, cloud, log, args):
             plist_in.append("%s:%s" % (u, p))
             users.append(u)
 
-        ch_in = '\n'.join(plist_in)
+        ch_in = '\n'.join(plist_in) + '\n'
         try:
             log.debug("Changing password for %s:", users)
             util.subp(['chpasswd'], ch_in)