Now we are handling the label values converting them as a dictionary.
But as magnum-api only accepts the input as string. We are converting
the dictionary into string and passing to magnum-api. It is parsing
the string to dictionary and storing the label value a dictionary.
Change-Id: I2cec19e24c6dd32e209ca65a26a2f1999d8289e0
Depends-on: I4d64da78dc4ed4d5599533b54861b65bce609c28
Closes-Bug: #1659189