Fix nexus 3 timeout when fetching npm packages

Many builds timeout when it comes to fetch npm packages:

• https://qa.nuxeo.org/jenkins/job/TestAndPush/job/ondemand-testandpush-saouana/3/console

  12:18:14 install:
  12:21:47      [exec] npm WARN deprecated gulp-util@3.0.8: gulp-util is deprecated - replace it, following the guidelines at https://medium.com/gulpjs/gulp-util-ca3b1f9f9ac5
  12:29:59      [exec] npm WARN deprecated bower@1.8.8: We don't recommend using Bower for new projects. Please consider Yarn and Webpack or Parcel. You can read how to migrate legacy project here: https://bower.io/blog/2017/how-to-migrate-away-from-bower/
  12:34:33      [exec] npm WARN deprecated browserslist@1.7.7: Browserslist 2 could fail on reading Browserslist >3.0 config used in other tools.
  12:37:34      [exec] npm WARN deprecated graceful-fs@3.0.11: please upgrade to graceful-fs 4 for compatibility with current and future versions of Node.js
  12:48:13      [exec] npm WARN deprecated nomnom@1.8.1: Package no longer supported. Contact support@npmjs.com for more info.
  12:49:20      [exec] npm WARN deprecated minimatch@2.0.10: Please update to minimatch 3.0.2 or higher to avoid a RegExp DoS issue
  12:51:29      [exec] npm WARN deprecated @types/winston@2.4.4: This is a stub types definition. winston provides its own type definitions, so you do not need this installed.
  12:56:21      [exec] npm WARN deprecated formatio@1.2.0: This package is unmaintained. Use @sinonjs/formatio instead
  12:56:23      [exec] npm WARN deprecated text-encoding@0.6.4: no longer maintained
  12:56:24      [exec] npm WARN deprecated samsam@1.3.0: This package has been deprecated in favour of @sinonjs/samsam
  12:56:59      [exec] npm WARN deprecated circular-json@0.3.3: CircularJSON is in maintenance only, flatted is its successor.
  12:57:12 Build timed out (after 240 minutes). Marking the build as aborted.
  

• https://qa.nuxeo.org/jenkins/job/web-ui-pipeline-nsilva/82/console

  11:29:42  + npm install --no-package-lock
  11:36:04  npm WARN deprecated bower@1.8.8: We don't recommend using Bower for new projects. Please consider Yarn and Webpack or Parcel. You can read how to migrate legacy project here: https://bower.io/blog/2017/how-to-migrate-away-from-bower/
  11:46:12  npm WARN deprecated formatio@1.1.1: This package is unmaintained. Use @sinonjs/formatio instead
  11:46:14  npm WARN deprecated samsam@1.1.2: This package has been deprecated in favour of @sinonjs/samsam
  11:55:21  npm WARN deprecated nomnom@1.8.1: Package no longer supported. Contact support@npmjs.com for more info.
  11:57:27  npm WARN deprecated circular-json@0.3.3: CircularJSON is in maintenance only, flatted is its successor.
  11:59:29  Cancelling nested steps due to timeout
  11:59:29  Sending interrupt signal to process
  

• https://qa.nuxeo.org/jenkins/job/Client/job/browser-developer-extension-master/job/master/1596/console

  11:37:27  [INFO] Installed npm locally.
  11:37:27  [INFO] 
  11:37:27  [INFO] --- frontend-maven-plugin:1.3:npm (npm install) @ nuxeo-browser-extension-ftest ---
  11:37:27  [INFO] Running 'npm install' in /opt/jenkins/workspace/per-extension-master_master-5B24ADNVCPRPPIEGOUIJXL6CJYRXOEBY2ZOD4ZXB5LFV4SGOCRFQ
  11:38:35  [WARNING] npm WARN deprecated gulp-util@3.0.8: gulp-util is deprecated - replace it, following the guidelines at https://medium.com/gulpjs/gulp-util-ca3b1f9f9ac5
  12:24:27  [WARNING] npm WARN deprecated samsam@1.3.0: This package has been deprecated in favour of @sinonjs/samsam
  12:36:05  Cancelling nested steps due to timeout
  12:36:05  Sending interrupt signal to process
  12:36:15  After 10s process did not stop