Install azure-cli on Mac and CentOS

In Mac

1. Install brew.
2. brew install nodejs
3. echo "registry = https://registry.npm.taobao.org" > ~/.npmrc
4. npm install azure-cli -g

In CentOS

1. Install epel
2. yum install -y nodejs npm
3. echo "registry = https://registry.npm.taobao.org" > ~/.npmrc
4. npm install azure-cli -g