Correct configuration setting using NUMBER_FAKE_NOVA_COMPUTE

In Change-Id Ia3843818014f7c6c7526ef3aa9676bbddb8a85ca the 'host'
setting used for each of the fake compute hosts was accidentally named
'nhost' ('\nhost' was edited poorly), so the setting doesn't actually do
anything: you create multiple nova-compute processes they think they are
all on the same host and only one hypervisor and resource provider is
created.

With the correction in place, the wait_for_compute function needs to be
updated to be aware of the fact that the hostnames on the compute
services will have a numeric prefix when the fake virt driver is used.

Change-Id: I5e8430d170c0b1c4f195ebe510aff8be59e4a3bc
diff --git a/lib/nova b/lib/nova
index fea2b85..a6ad907 100644
--- a/lib/nova
+++ b/lib/nova
@@ -877,7 +877,7 @@
             # creating or modifying real configurations. Each fake
             # gets its own configuration and own log file.
             local fake_conf="${NOVA_FAKE_CONF}-${i}"
-            iniset $fake_conf DEFAULT nhost "${HOSTNAME}${i}"
+            iniset $fake_conf DEFAULT host "${HOSTNAME}${i}"
             run_process "n-cpu-${i}" "$NOVA_BIN_DIR/nova-compute --config-file $NOVA_CPU_CONF --config-file $fake_conf"
         done
     else