Added parts token unpledging & Fix : Pledge token sending

[vaishnav-ch]

• Added parts token type in unpledging and proof verification functions.
• Updated token details fetching method in proof verification function for fixing leveldb not found issue during pledged token transfer.

[vaishnav-ch]

Test cases

Unpledging of parts token

Node where unpledged parts are existing- Unpledging of parts/whole is working Node where new parts are pledged- Unpledging of parts/whole is working

Transfer of Unpledged tokens

Sender/Receiver- A, B, C, D Quorums- Q1- Q10

Case1: Quorum node to become Sender/Receiver Node

• A to B & B to A transferred 3 RBTs as multiple transfers with only parts, only whole and combi of parts and whole with Q1- Q5 as quorum. - Transfer working
• Q1 is changed to sender/receiver
• Q1 to C & C to Q1 transferred 2 RBTs (All Unpledged tokens) as multiple transfers with only parts, only whole and combi of parts and whole. - Transfer working

Case2: Quorum node to become Sender/Receiver Node and back to a Quorum Node again

• A to B & B to A transferred 3 RBTs as multiple transfers with only parts, only whole and combi of parts and whole with Q1- Q5 as quorum. - Transfer working
• Q1 is changed to sender/receiver
• Q1 to C & C to Q1 transferred 2 RBT (All Unpledged tokens) as multiple transfers with only parts, only whole and combi of parts and whole with Q2 to Q6 as quorums- Transfer working
• Q1 is changed to quorum again.
• A to B and B to A transferred 3 RBTs as multiple transfers with only parts, only whole and combi of parts and whole with Q1- Q5- Transfer working

Case3: Quorum node to become Sender/Receiver node with a new set of quorum

• A to B & B to A transferred 3 RBTs as multiple transfers with only parts, only whole and combi of parts and whole with Q1- Q5 as quorum. - Transfer working
• Q1 is changed to sender/receiver
• Q1 to C & C to Q1 transferred 2 RBT (All Unpledged tokens) as multiple transfers with only parts, only whole and combi of parts and whole with Q6 to Q10 as quorums- Transfer working

Case4: A, B, C, D and Q1 to Q10 become Sender/Receiver/Quorum in random order

• All transfers working

(will modify after another round of testing)