Fixes errors when nova is disabled

This patch checks if nova is disabled in some
plugins so we can run packstack with
CONFIG_NOVA_INSTALL=n

Added also an ALL option to the firewall
template.

Change-Id: I05a9bd55c89d4009e28307248d74624533d47240
Fixes: rhbz#987888 rhbz#1024564 rhbz#1026795

packstack/installer/utils/__init__.py

@@ -4,7 +4,8 @@ from .datastructures import SortedDict
 from .decorators import retry
 from .network import get_localhost_ip, host2ip, force_ip, device_from_ip
 from .shell import ScriptRunner, execute
-from .shortcuts import host_iter, hosts, get_current_user, get_current_username
+from .shortcuts import host_iter, hosts, get_current_user,\
+     get_current_username, split_hosts
 from .strings import COLORS, color_text, mask_string
 
 
@@ -13,4 +14,4 @@ __all__ = ('SortedDict',
            'get_localhost_ip', 'host2ip', 'force_ip', 'device_from_ip',
            'ScriptRunner', 'execute',
            'host_iter', 'hosts', 'get_current_user', 'get_current_username',
-           'COLORS', 'color_text', 'mask_string')
+           'split_hosts', 'COLORS', 'color_text', 'mask_string')

packstack/installer/utils/shortcuts.py

@@ -38,3 +38,12 @@ def get_current_username():
     user = pwd.getpwuid(uid).pw_name
     group = grp.getgrgid(gid).gr_name
     return user, group
+
+
+def split_hosts(hosts_string):
+    hosts = set()
+    for host in hosts_string.split(','):
+        shost = host.strip()
+        if shost:
+            hosts.add(shost)
+    return hosts