[#277] getsvc: Rename and reorder code

Rename execCtx to request.
Move code to appropriate files.

Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>

pkg/services/object/get/status.go

@@ -0,0 +1,14 @@
+package getsvc
+
+const (
+	statusUndefined int = iota
+	statusOK
+	statusINHUMED
+	statusVIRTUAL
+	statusOutOfRange
+)
+
+type statusError struct {
+	status int
+	err    error
+}