Mock api for resource mgmt

[robin2008]

This is the Mock APIs for https://github.ibm.com/xcat2/task_management/issues/256

UT:

• apply 3 resources

  curl -X POST "http://10.6.27.1:5000/api/v2/manager/resmgr" -H  "accept: application/json" -H  "Content-Type: application/json" -d "{  \"capacity\": 3}"
  {
  "f9b5f8bc-77b5-11e9-93c6-0cc47aea9e02": "c461c022,mid05tor12cn15,mid05tor12cn08"
  }

• Get all occupied resources

  curl -X GET "http://10.6.27.1:5000/api/v2/manager/resmgr"
  {
  "f9b5f8bc-77b5-11e9-93c6-0cc47aea9e02": [
      "c461c022",
      "mid05tor12cn15",
      "mid05tor12cn08"
  ]
  }

• Get free pool resources

  curl -X GET "http://10.6.27.1:5000/api/v2/manager/resmgr?pool=1"
  {
  "total": 34,
  "pool": [
      "abcd",
      "mid05tor12cn02",
      "mid05tor12cn01",
      "mid05tor12cn06",
      "mid05tor12cn07",
      "mid05tor12cn04",
      "mid05tor12cn03",
      "mid05tor12cn09",
      "mid05tor25",
      "mid05",
      "mid05tor12cn14",
      "c910f05c01bc07",
      "c461c026",
      "mid05tor12cn05",
      "testnode",
      "mid05tor12cn11",
      "mid05tor12cn10",
      "mid05tor12cn13",
      "mid05tor12cn12",
      "ipminode",
      "mid05tor12cn17",
      "mid05tor12cn16",
      "mid05tor12cn18",
      "core01",
      "node0001",
      "node0002",
      "mid05tor12",
      "mgmtsw01",
      "mid05tor12cn02k02",
      "mid05tor12cn16-ipmi",
      "testnodes",
      "node-8335-gth-1318c4a",
      "mid05tor12cn05-bmc",
      "mid05tor12cn05-bmc-test"
  ]
  }

• free resource

  
  curl -X DELETE "http://10.6.27.1:5000/api/v2/manager/resmgr?name=c461c022" -H  "accept: application/json"

curl -X GET "http://10.6.27.1:5000/api/v2/manager/resmgr" {}

[bybai]

I am OK to merge it.