Docker: Accept more ways to identify a docker FilePath

Accept (percent-encoded) repo:tag, the image id or the device id as
host() part of a docker FilePath.

Task-number: QTCREATORBUG-26856
Change-Id: I27d374be31d54bab77d129e19884b7f7fd93daa0
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/docker/dockerdevice.h

@@ -37,10 +37,8 @@ namespace Internal {
 class DockerDeviceData
 {
 public:
-    // Used for "docker run" and for host parts of FilePaths
-    QString dockerId() const;
-    // Used as autodetection source string
-    QString autodetectId() const { return "docker:" + dockerId(); }
+    // Used for "docker run"
+    QString repoAndTag() const;
 
     QString imageId;
     QString repo;