Added acquire_ticket_vm API to retrieve a screen ticket

[marbe]

Added acquire_ticket_vm API to retrieve a screen ticket for VMRC browser plugin

• API Documentation:

  http://pubs.vmware.com/vcd-55/index.jsp#com.vmware.vcloud.api.doc_55/GUID-0DF63045-16D7-49E7-878E-B56E27F99C62.html

  http://pubs.vmware.com/vcd-55/index.jsp?topic=%2Fcom.vmware.vcloud.api.reference.doc_55%2Fdoc%2Foperations%2FPOST-AcquireTicket.html

• Implementation example:

  https://www.vmware.com/support/vcd/doc/vcd-1.5-vmrc-api-example.zip

• VMRC documentation:

  https://www.vmware.com/pdf/vcd_15_vmrc_api.pdf

[coveralls]

Coverage increased (+0.26%) when pulling 467959d5fd3f6fab9181f9c57350b34de4bbd199 on marbe:master into e7abcf5aac9eab716dc0edff59ce6210281d55e6 on astratto:master.

[coveralls]

Coverage increased (+0.26%) when pulling cda50ba31fa888bbe4ed6aefb4efe276a051012a on marbe:master into e7abcf5aac9eab716dc0edff59ce6210281d55e6 on astratto:master.

[astratto]

Thanks!