[libvirt] ESX [09/12]: Add esxDomainDefineXML()

A given domain XML gets converted to a VMX config, uploaded to the host and registered as new virtual machine. * src/esx/esx_driver.c: refactor datastore related path parsing into esxUtil_ParseDatastoreRelatedPath() * src/esx/esx_util.[ch]: add esxUtil_ParseDatastoreRelatedPath() * src/esx/esx_vi.[ch]: add esxVI_Context_UploadFile(), add datastores to the traversal in esxVI_BuildFullTraversalSpecList(), add esxVI_LookupDatastoreByName() * src/esx/esx_vi_methods.[ch]: add esxVI_RegisterVM_Task() * src/esx/esx_vi_types.c: make some error message more verbose * src/esx/esx_vmx.[ch]: add esxVMX_AbsolutePathToDatastoreRelatedPath() to convert a path into a datastore related path, add esxVMX_ParseFileName() to convert from VMX path format to domain XML path format, extend the other parsing function to be datastore aware, add esxVMX_FormatFileName() to convert from domain XML path format to VMX path format, fix VMX ethernet entry formating * tests/esxutilstest.c: add test for esxUtil_ParseDatastoreRelatedPath() * tests/vmx2xmldata/*: update domain XML files to use datastore related paths * tests/xml2vmxdata/*: update domain XML files to use datastore related paths, update VMX files to use absolute paths