Fix edge case where wait-scripts would return 1 instead of 0

When W_ITERATIONS is equal to 0, the wait scripts should return
exit code 0

Signed-off-by: Marios Andreopoulos <opensource@andmarios.com>

Author: andmarios

filesystem/usr/local/share/landoop/wait-scripts/wait-for-connect.sh

@@ -15,4 +15,8 @@ for ((i=0;i<$W_ITERATIONS;i++)); do
         && { sleep $(( RANDOM%(5*W_PERIOD_SECS) )); exit 0; }
 done
 
-exit 1
+if [[ $W_ITERATIONS == 0 ]]; then
+    exit 0
+else
+    exit 1
+fi

filesystem/usr/local/share/landoop/wait-scripts/wait-for-kafka.sh

@@ -2,7 +2,6 @@
 
 W_ITERATIONS=${W_ITERATIONS:-60}
 W_PERIOD_SECS=${W_PERIOD_SECS:-2}
-W_ALLOW_FAIL=${W_ALLOW_FAIL:-0}
 W_BROKERS_WANTED=${W_BROKERS_WANTED:-1}
 W_ZK_ADDRESS=${W_ZK_ADDRESS:-127.0.0.1}
 W_ZK_PORT=${W_ZK_PORT:-$ZK_PORT}
@@ -18,4 +17,8 @@ for ((i=0;i<$W_ITERATIONS;i++)); do
     fi
 done
 
-exit 1
+if [[ $W_ITERATIONS == 0 ]]; then
+    exit 0
+else
+    exit 1
+fi

filesystem/usr/local/share/landoop/wait-scripts/wait-for-registry.sh

@@ -9,4 +9,8 @@ for ((i=0;i<$W_ITERATIONS;i++)); do
     curl -sS "$W_SR_ADDRESS" | grep "{}" && exit 0
 done
 
-exit 1
+if [[ $W_ITERATIONS == 0 ]]; then
+    exit 0
+else
+    exit 1
+fi

filesystem/usr/local/share/landoop/wait-scripts/wait-for-zookeeper.sh

@@ -11,4 +11,8 @@ for ((i=0;i<$W_ITERATIONS;i++)); do
     echo ruok | nc $W_ZK_ADDRESS $W_ZK_PORT | grep imok && exit 0
 done
 
-exit 1
+if [[ $W_ITERATIONS == 0 ]]; then
+    exit 0
+else
+    exit 1
+fi