[services] optimize startup time on warm boot#3651

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stepanblyschak wants to merge 4 commits intosonic-net:masterfrom

stepanblyschak:start_opt

Commits on Oct 21, 2019

[services] improve startup time by given precedence to critical services
Stepan Blyschak
committed
[services] make snmp.timer work again and delay telemetry.service
Stepan Blyschak
committed

Commits on Oct 22, 2019

[sonic-cfggen] optimize execution time
Stepan Blyschak
committed
[sonic-cfggen] do lazy regexp compilation to speedup sonic-cfggen
Stepan Blyschak
committed