Configure task to install npm modules

There is a specific module for installing npm modules that should be used
instead of the shell module.

roles/explorer/tasks/main.yml

@@ -36,7 +36,8 @@
 - file: path={{ home }}/chain-explorer owner={{ username }} group={{ username }} recurse=yes
 
 - name: install npm chain_explorer
-  shell: "cd /home/{{ username }}/chain-explorer; /usr/bin/npm install"
+  npm:
+    path: "/home/{{ username }}/chain-explorer"
   become: true
   become_user: "{{ username }}"
   notify:

roles/moc/tasks/main.yml

@@ -39,16 +39,19 @@
 - file: path={{ home }}/poa-scripts-moc owner={{ username }} group={{ username }} recurse=yes
 
 - name: install npm initial_keys_script
-  shell: "cd {{ home }}/poa-scripts-moc; /usr/bin/npm install"
+  npm:
+    path: "{{ home }}/poa-scripts-moc"
   become: true
   become_user: "{{ username }}"
 
 - name: install npm generateInitialKey
-  shell: "cd {{ home }}/poa-scripts-moc/generateInitialKey; /usr/bin/npm install"
+  npm:
+    path: "{{ home }}/poa-scripts-moc/generateInitialKey"
   become: true
   become_user: "{{ username }}"
 
 - name: install npm distributeTokens
-  shell: "cd {{ home }}/poa-scripts-moc/distributeTokens; /usr/bin/npm install"
+  npm:
+    path: "{{ home }}/poa-scripts-moc/distributeTokens"
   become: true
   become_user: "{{ username }}"

roles/netstat/tasks/main.yml

@@ -12,14 +12,17 @@
 - file: path={{ home }}/eth-netstats owner={{ username }} group={{ username }} recurse=yes
 
 - name: install npm netstats
-  shell: "cd /home/{{ username }}/eth-netstats; /usr/bin/npm install"
+  npm:
+    path: "/home/{{ username }}/eth-netstats"
   become: true
   become_user: "{{ username }}"
   notify:
     - restart poa-dashboard
 
 - name: install npm grunt-cli
-  shell: "cd /home/{{ username }}/eth-netstats; /usr/bin/npm install -g grunt-cli"
+  npm:
+    name: grunt-cli
+    global: yes
 
 - name: run grunt process
   shell: "cd /home/{{ username }}/eth-netstats; grunt"

roles/poa-netstats/tasks/main.yml

@@ -25,7 +25,8 @@
 - file: path={{ home }}/eth-net-intelligence-api owner={{ username }} group={{ username }} recurse=yes
 
 - name: install npm netstats
-  shell: "cd /home/{{ username }}/eth-net-intelligence-api; /usr/bin/npm install"
+  npm:
+    path: "/home/{{ username }}/eth-net-intelligence-api"
   become: true
   become_user: "{{ username }}"
   notify:

roles/validator/tasks/main.yml

@@ -41,7 +41,8 @@
 - file: path={{ home }}/poa-scripts-validator owner={{ username }} group={{ username }} recurse=yes
 
 - name: install npm transferRewardToPayoutKey
-  shell: "cd {{ home }}/poa-scripts-validator/transferRewardToPayoutKey; /usr/bin/npm install"
+  npm:
+    path: "{{ home }}/poa-scripts-validator/transferRewardToPayoutKey"
   become: true
   become_user: "{{ username }}"
   notify: