Revert "post body change to apply changes"

- this change does not add support for 1.7
- according to the docs on a 1.7 Ops Manager, the /api/v0/installations
  endpoint takes a multi-part form body, not a JSON object

This reverts commit 53f2cea.

api/installations_service.go

@@ -31,7 +31,7 @@ func NewInstallationsService(client httpClient) InstallationsService {
 }
 
 func (is InstallationsService) Trigger() (InstallationsServiceOutput, error) {
- req, err := http.NewRequest("POST", "/api/v0/installations", strings.NewReader(`{enabled_errands: {}}`))
+ req, err := http.NewRequest("POST", "/api/v0/installations", strings.NewReader(`{}`))
  if err != nil {
  return InstallationsServiceOutput{}, err
  }

api/installations_service_test.go

@@ -42,7 +42,7 @@ var _ = Describe("InstallationsService", func() {
 
  body, err := ioutil.ReadAll(req.Body)
  Expect(err).NotTo(HaveOccurred())
- Expect(string(body)).To(Equal(`{enabled_errands: {}}`))
+ Expect(string(body)).To(Equal("{}"))
  })
 
  Context("when an error occurs", func() {