echo controller version at startup and remove --master flag

[M00nF1sh]

1. add build Flag to populate version.
2. remove the '--master' flag as it's deprecated by upstream as well.
3. added a concise logger, which will no longer log these stacktraces. (which is not useful due to nested go routines).
4. optimize the code layout

new error message:

{"level":"error","ts":1602732820.192087,"logger":"setup","msg":"unable to load controller config","error":"kubernetes cluster name must be specified"}

old error message:

{"level":"error","ts":1602732290.3767838,"logger":"setup","msg":"unable to load controller config","error":"kubernetes cluster name must be specified","errorVerbose":"kubernetes cluster name must be specified\nsigs.k8s.io/aws-load-balancer-controller/pkg/config.(*ControllerConfig).Validate\n\t/Volumes/workplace/aws-alb-ingress-controller/pkg/config/controller_config.go:63\nmain.loadControllerConfig\n\t/Volumes/workplace/aws-alb-ingress-controller/main.go:150\nmain.main\n\t/Volumes/workplace/aws-alb-ingress-controller/main.go:67\nruntime.main\n\t/usr/local/Cellar/go/1.15/libexec/src/runtime/proc.go:204\nruntime.goexit\n\t/usr/local/Cellar/go/1.15/libexec/src/runtime/asm_amd64.s:1374"}

[k8s-ci-robot]

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