test: fs pkglock lstatSync

[jchip]

• first fs test that uses pkglock
• need to add a process.tink._isSelf_ to by pass the self check

[jchip]

test was still passing with this commit:

commit bc20c7c68509be6b5d9f6c467fb61d7883f8c4b7
Author: Kat Marchán <[email protected]>
Date:   Wed Nov 28 20:26:27 2018 -0800

    refactor(node): move the extensions bit to its own module

2 new commits after that cause the test to fail with:

notice fs fetching [email protected]
ERR! prepare Error: No dependencies found matching filter
ERR! prepare     at Installer.prepare (/Users/xchen11/dev/pub/tink/lib/installer.js:6:1776)
ERR! prepare  { Error: No dependencies found matching filter
ERR! prepare     at Installer.prepare (/Users/xchen11/dev/pub/tink/lib/installer.js:6:1776)
ERR! prepare   stack:
ERR! prepare    'Error: No dependencies found matching filter\n    at Installer.prepare (/Users/xchen11/dev/pub/tink/lib/installer.js:6:1776)' }
test/node/fs-pkglock.js ............................... 0/2 1s
  lstatSync
  not ok fs-pkglock.lstatSync caught Error: No cache entry for tinked-package:2.0.0:require-from-path:1.0.2:https://registry.npmjs.org/require-from-path/-/require-from-path-1.0.2.tgz:sha512-hZrak6935a0RVpx6SFJg59IhRuwWkOBX4VPevL8iyxwoT8ep+ILMziLd1f6s5UCeZ6ckEk06xvfAe2I+3IpUaQ== found in /Users/xchen11/dev/pub/tink/test/.cache

[jchip]

@zkat any pointer in the error? I should get a few hours this/next week and will try to resolve this.