change how we store SKF for performance gains #1278

Job	Run time
suites	3s
build	5m 42s
xref	1m 27s
eunit	2m 1s
dialyzer	5m 34s
ct (hpr_grpc_load_SUITE.erl)	2m 51s
ct (hpr_metrics_SUITE.erl)	3m 9s
ct (hpr_packet_router_service_SUITE.erl)	3m 4s
ct (hpr_packet_reporter_SUITE.erl)	3m 31s
ct (hpr_protocol_gwmp_SUITE.erl)	4m 15s
ct (hpr_protocol_http_roaming_packet_SUITE.erl)	3m 20s
ct (hpr_protocol_router_SUITE.erl)	3m 34s
ct (hpr_route_stream_worker_SUITE.erl)	3m 16s
ct (hpr_routing_SUITE.erl)	3m 49s
release	1m 16s
	46m 52s

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