core: Add ability to call plsql function with different mappers

We are calling GetTagVmByTagIdAndByvmId
plsql function in getTagTemplateByTagIdAndByTemplateId
and getTagVmByTagIdAndByVmId with different row mappers.

This patch sets the rowmapper in the SimpleJdbcCall
which is saved in the map by function name

Change-Id: I003e2b054db3eb406984fd39b59a346c7fd85492
Signed-off-by: Ravi Nori <rnori@redhat.com>