Description of problem:
kickstart.profile.set_advanced_options does not update kickstart file, when url option argument is set without server hostname (like --url /ks/dist/ks-rhel-x86_64-server-6-6.4)

Version-Release number of selected component (if applicable):
spacewalk-java-2.3.8-142.el6sat.noarch
cobbler-2.0.7-66.el6sat.noarch


How reproducible:
100%

Steps to Reproduce:
1. Create kickstart profile named test-kickstart
2.
# Modify advanced options
KS_LABEL = "test-kickstart"
new_advopt_arr = []
for option in client.kickstart.profile.get_advanced_options(key, KS_LABEL):
    if option['name'] == 'url':
        new_advopt_arr.append({'name': 'url', 'arguments': '--url /ks/dist/' +
                               'ks-rhel-x86_64-server-6-6.8'})
    else:
        new_advopt_arr.append(option)

client.kickstart.profile.set_advanced_options(key, KS_LABEL, new_advopt_arr)

3.
# Check output of kickstart.profile.getAdvancedOptions
spacewalk-api --server=localhost --user=admin --password=nimda kickstart.profile.getAdvancedOptions "%session%" test-kickstart | 
    perl -le 'undef$/;eval<>;$_->{'name'}eq 'url'&&print$_->{'arguments'}for@$result' | rev | cut -d/ -f 1 | rev

// output
ks-rhel-x86_64-server-6-6.8

-------

# Check cobbler 
cobbler profile getks --name=test-kickstart:1:RedHatSatTeamQA | grep ^url | rev | cut -d/ -f 1 | rev

// output
ks-rhel-x86_64-server-6-6.0


Same old value is in System -> Kickstart -> Profiles -> test-kickstart -> Kickstart File

Actual results:
Kickstart file is not updated

Expected results:
Kickstart file should contain updated url

Additional info:
It doesn't update Kickstart file even when using web ui