[thread-cert] set node addr64 to EXTENDED_ADDRESS_BASE + nodeid (#5601)
[thread-cert] set node addr64 to EXTENDED_ADDRESS_BASE + nodeid (#5601)

This commit sets nodes' extaddrs to 0x166e0a0000000000 + nodeid, which
does not change node behavior but makes it easier for us to analyze
pcaps.
abtink/openthread,chshu/openthread,chshu/openthread,chshu/openthread,srickardti/openthread,openthread/openthread,bukepo/openthread,srickardti/openthread,chshu/openthread,abtink/openthread,chshu/openthread,bukepo/openthread,openthread/openthread,openthread/openthread,jwhui/openthread,jwhui/openthread,openthread/openthread,srickardti/openthread,abtink/openthread,bukepo/openthread,srickardti/openthread,abtink/openthread,jwhui/openthread,bukepo/openthread,chshu/openthread,jwhui/openthread