Updated winrm and winrmcp dependencies. Relevant unit and acceptance tests passed successfully.
shell.Execute didn't return a Command object.
See f1bcf36a69/winrmcp/cp.go (L167) and 54ea5d0147/winrm/shell.go (L10-L22) respectively.
Closes#3763
Original patch by: Philipp Kosel <philipp.kosel@gmail.com>