Fix photon controller plugin to construct with correct PdID
Fix photon controller plugin to construct with correct PdID

The input variable of function ConstructVolumeSpec is the volume spec
name instead of persistent disk ID. Previously the function directly
construct new volume spec by assigning volume spec name to persistent
disk ID, which will result in mismatching of mount path. The fix will
find the pdID according to mount path and construct volume spec with the
correct pdID.

stefanschneider/kubernetes,stefanschneider/kubernetes,stefanschneider/kubernetes,stefanschneider/kubernetes,stefanschneider/kubernetes