Add upload-npm role

We need a role for uploading content to npm. The old script assumed a
global npm install - but as this runs on the executor we shouldn't
assume that. Use nvm to install node into the work_dir and use the npm
from that node installation.

Change-Id: I7f7c031ce754838776043325025fe5928cd36135

roles/upload-npm/README.rst

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+Upload javascript packages to npm
+
+**Role Variables**
+
+.. zuul:rolevar:: npm_info
+
+   Complex argument which contains the information about the npm
+   server as well as the authentication information needed.
+   It is expected that this argument comes from a `Secret`.
+   This role expects to be run on the executor.
+
+  .. zuul:rolevar:: username
+
+     Username to use to log in to npm.
+
+  .. zuul:rolevar:: password
+
+     Password to use to log in to npm.
+
+  .. zuul:rolevar:: email
+
+     Email associated with the npm account.
+
+  .. zuul:rolevar:: author_name
+
+     npm author name.
+
+  .. zuul:rolevar:: author_url
+
+     npm author url.
+
+  .. zuul:rolevar:: author_email
+
+     npm author email.
+
+  .. zuul:rolevar:: registry_url
+     :default: //registry.npmjs.org
+
+     URL of npm registry server.

roles/upload-npm/defaults/main.yaml

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+npm_registry_url: "{{ npm_info.registry_url|default('//registry.npmjs.org') }}"

roles/upload-npm/tasks/main.yaml

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+# This is not optimized, but allows for getting a version of node in the
+# home dir.
+- name: Create .npmrc configuration file
+  template:
+    dest: "~/.npmrc"
+    mode: 0400
+    src: .npmrc.j2
+
+- name: Install NVM
+  git:
+    repo: 'https://github.com/creationix/nvm'
+    dest: '~/.nvm'
+    version: v0.33.5
+
+- name: Upload tarball to npm
+  shell:
+    executable: /bin/bash
+    cmd: |
+      nvm install node
+      nvm use node
+      npm publish --ignore-scripts {{ zuul.executor.work_dir }}/artifacts/{{ zuul.project.short_name }}-{{ project_ver }}.tar.gz

roles/upload-npm/templates/.npmrc.j2

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+init.author.name={{ npm_info.author_name }}
+init.author.email={{ npm_info.author_email }}
+init.author.url={{ npm_info.author_url }}
+tag-version-prefix=
+sign-git-tag=true
+
+//registry.npmjs.org/:username={{ npm_info.username }}
+//registry.npmjs.org/:_password={{ npm_info.password }}
+
+//registry.npmjs.org/:email={{ npm_info.author_email }}