check-url: Quote $URL in -z check
If one wants to check URLs on UNIX-sockets, there is no full URL schema
in curl for this, but the following has to be used instead:
curl --unix-socket /path/to/socket http:/<url-path>
For this to work, one can do e.g. the following trick:
[promise-unicorn]
recipe = slapos.cookbook:check_url_available
url = --unix-socket ${unicorn:socket} http:/
but then generated promise scripts fails this way:
./etc/promise/unicorn: line 7: [: too many arguments
via quoting $URL in emptiness check we can support both usual URLs and
urls with --unix-socket prepended trick.
/reviewed-by @cedric.leninivin (on nexedi/slapos!31)
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