emit an error log when setting a breakpoint fails in gdbserver

[koalatux]

I found having an error logged in pyOCD useful, when the IDE silently ignored the error reported by gdbserver.

[ithinuel]

Hi, thank you for your contribution. I think it would be better to add that in the breakpoint manager instead (where other set_breakpoint are reported).

As far as I can see this would be in:

• pyocd/coresight/fpb.py
• pyocd/debug/breakpoints/manager.py
• pyocd/debug/breakpoints/software.py