Fixed JSON output from pyocd-gdbserver.
Fixed JSON output from pyocd-gdbserver.

Signed-off-by: Chris Reed <b3dd1f1606e650f957a201559ff4892bfe793d89@me.com>

bridadan/pyOCD,mbedmicro/pyOCD,flit/pyOCD,mesheven/pyOCD,bridadan/pyOCD,wjzhang/pyOCD,0xc0170/pyOCD,tgarc/pyOCD,mbedmicro/pyOCD,matthewelse/pyOCD,pyocd/pyOCD,tgarc/pyOCD,0xc0170/pyOCD,mesheven/pyOCD,tgarc/pyOCD,mbedmicro/pyOCD,wjzhang/pyOCD,mesheven/pyOCD,matthewelse/pyOCD,matthewelse/pyOCD,flit/pyOCD,0xc0170/pyOCD,bridadan/pyOCD,wjzhang/pyOCD,pyocd/pyOCD