Add com.mirantis.targetImg property to docker image property

com.mirantis.targetImg property allows to search docker
artifacts by image name, for example

  def properties = [
    'com.mirantis.gerritChangeId': "${env.GERRIT_CHANGE_ID}",
    'com.mirantis.gerritPatchsetNumber': "${env.GERRIT_PATCHSET_NUMBER}",
    'com.mirantis.gerritChangeNumber' : "${env.GERRIT_CHANGE_NUMBER}",
    'com.mirantis.targetImg': "${projectNamespace}/calico/node"
  ]

Change-Id: I8f6cdb0b90edb263e2d24e987eee8b8be2e54df3
diff --git a/src/com/mirantis/mcp/MCPArtifactory.groovy b/src/com/mirantis/mcp/MCPArtifactory.groovy
index fc999c0..5b63082 100644
--- a/src/com/mirantis/mcp/MCPArtifactory.groovy
+++ b/src/com/mirantis/mcp/MCPArtifactory.groovy
@@ -156,6 +156,7 @@
             'com.mirantis.gerritPatchsetNumber': "${env.GERRIT_PATCHSET_NUMBER}",
             'com.mirantis.gerritChangeId': "${env.GERRIT_CHANGE_ID}",
             'com.mirantis.gerritPatchsetRevision': "${env.GERRIT_PATCHSET_REVISION}",
+            'com.mirantis.targetImg': "${image}",
             'com.mirantis.targetTag': "${version}"
     ]