Lazy load lockfile library

[dapplion]

Motivation

lockfile registers many listeners to process right on require. We only use lockfile on the validator client so it doesn't feel clean to pollute the process with un-used listeners when running the beacon cmd.

Description

Lazy require the library. Trade-off is no types, but the function signatures are extremely simple. Since the lib is used in the constructor using await import() is not nice.

Trace: process.on() call with [ 'SIGABRT', [Function: listener] ]
Trace: process.on() call with [ 'SIGALRM', [Function: listener] ]
Trace: process.on() call with [ 'SIGHUP', [Function: listener] ]
Trace: process.on() call with [ 'SIGINT', [Function: listener] ]
Trace: process.on() call with [ 'SIGTERM', [Function: listener] ]
Trace: process.on() call with [ 'SIGVTALRM', [Function: listener] ]
Trace: process.on() call with [ 'SIGXCPU', [Function: listener] ]
Trace: process.on() call with [ 'SIGXFSZ', [Function: listener] ]
Trace: process.on() call with [ 'SIGUSR2', [Function: listener] ]
Trace: process.on() call with [ 'SIGTRAP', [Function: listener] ]
Trace: process.on() call with [ 'SIGSYS', [Function: listener] ]
Trace: process.on() call with [ 'SIGQUIT', [Function: listener] ]
Trace: process.on() call with [ 'SIGIOT', [Function: listener] ]
Trace: process.on() call with [ 'SIGIO', [Function: listener] ]
Trace: process.on() call with [ 'SIGPOLL', [Function: listener] ]
Trace: process.on() call with [ 'SIGPWR', [Function: listener] ]
Trace: process.on() call with [ 'SIGSTKFLT', [Function: listener] ]
Trace: process.on() call with [ 'SIGUNUSED', [Function: listener] ]
    at process.on (/home/lion/Code/eth2.0/lodestar/packages/cli/lib/index.js:5:11)
    at /home/lion/Code/eth2.0/lodestar/node_modules/signal-exit/index.js:128:15
    at Array.filter (<anonymous>)
    at load (/home/lion/Code/eth2.0/lodestar/node_modules/signal-exit/index.js:126:21)
    at module.exports (/home/lion/Code/eth2.0/lodestar/node_modules/signal-exit/index.js:36:5)
    at Object.<anonymous> (/home/lion/Code/eth2.0/lodestar/node_modules/lockfile/lockfile.js:34:1)
    at Module._compile (internal/modules/cjs/loader.js:999:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1027:10)
    at Module.load (internal/modules/cjs/loader.js:863:32)
    at Function.Module._load (internal/modules/cjs/loader.js:708:14)

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