Added clean exec functionality + ACI implementation - V2 (#244)

* Stubs and vkubelet changes

* added dependencies

* Azure provider exec implementation

* added missing dependencies

* added vkubelet imports

* added huawei exec stub

* Fixed exec tab functionality / stdin buffer length

* Removed unused import

* Added provider function GetPodFullName + ACI implementation

* Added error handling in ACI provider exec

vendor/github.com/docker/spdystream/utils.go

@@ -0,0 +1,16 @@
+package spdystream
+
+import (
+	"log"
+	"os"
+)
+
+var (
+	DEBUG = os.Getenv("DEBUG")
+)
+
+func debugMessage(fmt string, args ...interface{}) {
+	if DEBUG != "" {
+		log.Printf(fmt, args...)
+	}
+}