Bug 1050952

Description of problem:
$ copr-cli list

I didn't specify an URL, bur copr should preferably guess copr.fedoraproject.org or at least tell it to me in more decent way

Version-Release number of selected component:
copr-cli-1.21-1.fc20

Additional info:
reporter:       libreport-2.1.10
cmdline:        /usr/bin/python2 /usr/bin/copr-cli list
dso_list:       python-libs-2.7.5-9.fc20.x86_64
executable:     /usr/bin/copr-cli
kernel:         3.11.10-301.fc20.x86_64
runlevel:       N 5
type:           Python
uid:            1000

Truncated backtrace:
ConfigParser.py:618:get:NoOptionError: No option 'copr_url' in section: 'copr-cli'

Traceback (most recent call last):
  File "/usr/bin/copr-cli", line 9, in <module>
    load_entry_point('copr-cli==0.2.0', 'console_scripts', 'copr-cli')()
  File "/usr/lib/python2.7/site-packages/copr_cli/main.py", line 126, in main
    arg.func(arg)
  File "/usr/lib/python2.7/site-packages/copr_cli/main.py", line 44, in action_list
    subcommands.listcoprs(args.username)
  File "/usr/lib/python2.7/site-packages/copr_cli/subcommands.py", line 88, in listcoprs
    copr_api_url = get_api_url()
  File "/usr/lib/python2.7/site-packages/copr_cli/subcommands.py", line 74, in get_api_url
    copr_url = config.get('copr-cli', 'copr_url')
  File "/usr/lib64/python2.7/ConfigParser.py", line 618, in get
    raise NoOptionError(option, section)
NoOptionError: No option 'copr_url' in section: 'copr-cli'

Local variables in innermost frame:
d: {'username': 'churchyard', '__name__': 'copr-cli', 'login': 'secretsecret', 'token': 'secretoken'}
vars: None
section: 'copr-cli'
vardict: {}
raw: False
sectiondict: OrderedDict([('__name__', 'copr-cli'), ('username', 'churchyard'), ('login', 'secretsecret'), ('token', ''secretoken')])
self: <ConfigParser.ConfigParser instance at 0x136e5a8>
option: 'copr_url'