Description of problem:
When an alias from /etc/hosts file is used shell is not able to connect to the API

Version-Release number of selected component (if applicable):
rhevm-cli-3.5.0.5-1.el6ev.noarch

How reproducible:
100%

Steps to Reproduce:
1. set a new alias for RHEV-M
2. try to connect via this alias

Actual results:
Alias="rhevm35"
"https://rhevm35:443/ovirt-engine/api" is invalid url format, valid format is http[s]://server:port/path, where path is usually "ovirt-engine/api" or, for older versions of the engine, just "api".


Expected results:
The system either allow to use the alias or it provide more information about the URL format

Additional info:
The shell expect FQDN so rhevm35.example.com works.

from the code:

src/ovirtcli/command/connect.py:

    def is_valid_url(self, url):
        if url is None:
            return False;
        #self.error(url)
        regex = re.compile(
            r'^(?:http)s?://'  # http:// or https://
            r'(?:(?:[A-Z0-9](?:[A-Z0-9-]{0,61}[A-Z0-9])?\.)+(?:[A-Z]{2,6}\.?|[A-Z0-9-]{2,}\.?)|'  # domain...
            r'localhost|'  # localhost...
            r'\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}|'  # ...or ipv4
            r'\[?[A-F0-9]*:[A-F0-9:]+\]?)'  # ...or ipv6
            r'(?::\d+)?'  # optional port
           , re.IGNORECASE)
        if not regex.search(url):
            return False