BNS refactoring

[victor-tucci]

• BNS process are revamped.
• Only owners can renew the BNS.
• Signature verification added to renew mapping.
• All the process {Bchat, Wallet, Belnet} can map by the single BNS name.
• Instead of giving the expire for Belnet now the all the service have the expiration.
• Expiration are calculated by the years.
• BNS transactions are now in version=1.
• Query for the BNS are revamped.
• DB migration done for the new type of BNS.
• BNS price details are updated to the new value.
• Have to burn the BDX when owner update.

bns_buy_mapping:

_usage: bns_buy_mapping [index=[,,...]] [] [years=1y|2y|5y|10y] [owner=] [backup_owner=] [bchat_id=] [belnetid=] [address=]

bns_update_mapping:

_usage: bns_update_mapping [index=[,,...]] [] [owner=] [backup_owner=] [bchat_id=] [belnet_id=] [address=] [signature=] _

bns_renew_mapping:

_usage: bns_renewmapping [index=[,,...]] [] [years=1y|2y|5y|10y]

[victor-tucci]

The check is failed due to the previous commit #114. which will be fix in the next commit