Fixes dict metadata query issue of HBase

Now HBase doesn't support query the metadata with the dictionary
type. For example, the metadata of Glance image always has the
metadata "properties" which is dictionary and has some attributes,
size, kernel id, etc. So this fix will enable the HBase driver of
CM to support query like "metadata.properties.tag=test".

Fixes bug 1206022

Change-Id: I7fa73cea94a948d47e27492dfb7e3a0e005ccb48
Merge "Fixes dict metadata query issue of HBase"