net/py-python-bitcoinrpc: Update to 1.0

• Switch MASTER_SITE to CHEESESHOP
• Add NO_ARCH
• Update LICENSE to LGPL21
• Add LICENSE_FILE
• Allow concurrent installation (USE_PYTHON=concurrent)

Reviewed by: koobs, mat
Approved by: koobs (ports)
Submitted by: Gyver Def (gdef wp pl)
Differential Revision: https://reviews.freebsd.org/D9552