Use default nodes for all the host-specific manifests

This makes testing a bit easier

manifests/cucumber.pp

@@ -2,7 +2,7 @@
 #   Root manifest to be run on cucumber
 #
 
-node /^cucumber$/ {
+node default {
     include base
     include haproxy
     include apache2

manifests/eggplant.pp

@@ -2,7 +2,7 @@
 #   Root manifest to be run on eggplant (OSUOSL VM)
 #
 
-node /^eggplant$/ {
+node default {
     include base
 
     firewall {

manifests/lettuce.pp

@@ -2,7 +2,7 @@
 #   Root manifest to be run on lettuce
 #
 
-node /^lettuce$/ {
+node default {
     include base
 
     include user-kbsingh

manifests/spinach.pp

@@ -2,7 +2,7 @@
 #   Root manifest to be run on spinach (Rackspace-donated build machine)
 #
 
-node /^spinach$/ {
+node default {
     include base
     include user-jieryn
     include ci-ssh-slave