Drop args from container spec

The args with using the command `-d` is no longer necessary due to the
fact that the images already ship with a default value of using `-f`
which now runs in foreground without having to enable logging, which
should significantly decrease log noise.

Change-Id: Iea2f9d2d6179ea312207dd456df8d8098aa5a1c9

charts/zuul/templates/executor/statefulset.yaml

@@ -23,9 +23,6 @@ spec:
       containers:
       - name: executor
         image: zuul/zuul-executor:latest
-        args:
-        - /usr/local/bin/zuul-executor
-        - -d
         ports:
         - name: logs
           containerPort: 7900

charts/zuul/templates/merger/deployment.yaml

@@ -22,9 +22,6 @@ spec:
       containers:
       - name: merger
         image: zuul/zuul-merger:latest
-        args:
-        - /usr/local/bin/zuul-merger
-        - -d
         volumeMounts:
         - name: zuul-config
           mountPath: /etc/zuul

charts/zuul/templates/scheduler/statefulset.yaml

@@ -23,9 +23,6 @@ spec:
       containers:
       - name: launcher
         image: zuul/zuul-scheduler:latest
-        args:
-        - /usr/local/bin/zuul-scheduler
-        - -d
         ports:
         - name: gearman
           containerPort: {{ .Values.scheduler.gearman.port }}

charts/zuul/templates/web/deployment.yaml

@@ -22,9 +22,6 @@ spec:
       containers:
       - name: web
         image: zuul/zuul-web:latest
-        args:
-        - /usr/local/bin/zuul-web
-        - -d
         ports:
         - name: zuul-web
           containerPort: {{ .Values.web.port }}