Excluding Host from LQR Metrics

[vankerkh]

lqa.py has two known bugs:

• does not exclude self's responses when computing LQR for echo responses, and will therefore register itself as a healthy link.
• regex was done the easy-and-basically-good-enough way, instead of the true proper way. The regex will match the host's IP 1 extra time at the beginning (i.e. it mistakes the IP in this line as an echo response PING ff02::1(ff02::1) from fe80::77e6:4403:ae5:2b48 wlp3s0: 56 data bytes). Note this is only an issue when the total count of broadcast pings sent is less than or equal to TWO, otherwise the result will automatically be rejected by any reasonable LQR threshold.