mgr/cephadm: cephadm bootstrap add --apply-spec <cluster.yaml>

mgr/cephadm: cephadm bootstrap add --apply-spec <cluster.yaml>

Have a single command when setting up a cluster for Day 1

example spec

---
service_type: host
addr: jmo-node-00
hostname: jmo-node-00
labels:
- test
- test2
---
service_type: host
addr: jmo-node-01
hostname: jmo-node-01
labels:
- grafana
---
service_type: host
addr: jmo-node-02
hostname: jmo-node-02
---
service_type: grafana
placement:
  label: "grafana"
---
service_type: osd
placement:
  host_pattern: '*'
data_devices:
  all: true

Signed-off-by: Daniel-Pivonka <dpivonka@redhat.com>