More compact and escaped environment variable names in systemd service files

[l1n]

No description provided.

[ddollar]

Thanks!

[timurb]

The syntax works for me (with the exception of #664) but the new syntax is hardly readable.
Old:

[Service]
User=rails
WorkingDirectory=/opt/cga/current
Environment=PORT=%i
Environment=DB_HOST=XXXXXXX
Environment=DB_PORT=3306
Environment=DB_NAME=XXXXXXXX
Environment=DB_USERNAME=rails
Environment=DB_PASSWORD=XXXXXXX
Environment=MAILGUN_API_KEY=XXXXXX
Environment=MAILGUN_DOMAIN=XXXXXXXX
Environment=MAILGUN_PUBLIC_KEY=XXXXXXX
Environment=MAILGUN_SMTP_LOGIN=XXXXXXX
Environment=MAILGUN_SMTP_PASSWORD=XXXXXXX
Environment=MAILGUN_SMTP_PORT=587
Environment=MAILGUN_SMTP_SERVER=smtp.mailgun.org
.....a few more dozens of Environment lines....
ExecStart=/bin/bash -lc 'bundle exec unicorn -p $PORT -c ./config/unicorn.rb'

New (scroll to the side):

[Service]
User=rails
WorkingDirectory=/opt/cga/current
Environment=PORT=%i
Environment="DB_HOST=XXXXXXX" "DB_PORT=3306" "DB_NAME=XXXXXXXX" "DB_USERNAME=rails" "DB_PASSWORD=XXXXXXX" "MAILGUN_API_KEY=XXXXXX" "MAILGUN_DOMAIN=XXXXXXXX" "MAILGUN_PUBLIC_KEY=XXXXXXX" "MAILGUN_SMTP_LOGIN=XXXXXXX" "MAILGUN_SMTP_PASSWORD=XXXXXXX" "MAILGUN_SMTP_PORT=587" "MAILGUN_SMTP_SERVER=smtp.mailgun.org" 
ExecStart=/bin/bash -lc 'bundle exec unicorn -p $PORT -c ./config/unicorn.rb'

Variable quoting looks nice addition though and I'll keep it in place.
Here is my pull request with the fix: #665