Server error appears if ip range includes gateway

[Anastasia Palkina]

"build_id": "2015-01-28_22-55-01",
"ostf_sha": "c9100263140008abfcc2704732e98fbdfd644068",
"build_number": "84",
"release_versions": {"2014.2-6.1": {"VERSION": {"build_id": "2015-01-28_22-55-01", "ostf_sha": "c9100263140008abfcc2704732e98fbdfd644068", "build_number": "84", "api": "1.0", "nailgun_sha": "92a85025f0ef9b3c5b42a1ba172573aa0ac54e33", "production": "docker", "python-fuelclient_sha": "cb8928ce34f5ca88c0d6cecc6331488db75362ac", "astute_sha": "ed5270bf9c6c1234797e00bd7d4dd3213253a413", "feature_groups": ["mirantis"], "release": "6.1", "fuelmain_sha": "", "fuellib_sha": "b2fbaa9ffb74fafe1f5c2c480944a78424e1ae28"}}},
"auth_required": true,
"api": "1.0",
"nailgun_sha": "92a85025f0ef9b3c5b42a1ba172573aa0ac54e33",
"production": "docker",
"python-fuelclient_sha": "cb8928ce34f5ca88c0d6cecc6331488db75362ac",
"astute_sha": "ed5270bf9c6c1234797e00bd7d4dd3213253a413",
"feature_groups": ["mirantis"],
"release": "6.1",
"fuelmain_sha": "",
"fuellib_sha": "b2fbaa9ffb74fafe1f5c2c480944a78424e1ae28"

1. Create new environment (by default)
2. Open tab "Networks"
3. Change Start IP range for Public to 172.16.0.0 (see first attached screen). No warnings or errors
4. Click button "Save Changes". Server error appears (see second attached screen)

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/127287
Committed: https://git.openstack.org/cgit/stackforge/fuel-web/commit/?id=791f459fa431d2a7e8aafe458f7e317a3c6f3591
Submitter: Jenkins
Branch: master

commit 791f459fa431d2a7e8aafe458f7e317a3c6f3591
Author: Alexandra Morozova <email address hidden>
Date: Wed Oct 8 18:21:34 2014 +0200

    [React] Network tab to React

    - total refactoring performed, new tab architecture introduced
    - functional tests rewritten and some removed due to casper bugs
    - bug left with network tasks removal - will be fixed when API changes

    Closes-bug: #1394981
    Closes-bug: #1413913
    Closes-bug: #1415083
    Closes-bug: #1415875
    Closes-bug: #1415884

    Related to blueprint backbone-to-react

    Change-Id: Icd4f90b6b19ec58bdff897565a267cd365f7c12c

[Anastasia Palkina (apalkina)]

Verified on ISO #109

"build_id": "2015-02-09_22-54-44", "ostf_sha": "6c046b69d29021524906109f18092363505ee222", "build_number": "109", "release_versions": {"2014.2-6.1": {"VERSION": {"build_id": "2015-02-09_22-54-44", "ostf_sha": "6c046b69d29021524906109f18092363505ee222", "build_number": "109", "api": "1.0", "nailgun_sha": "71cb1dc573103e0faa6f54be687dd9fba57f6c8c", "production": "docker", "python-fuelclient_sha": "521c2491f7f04f31d8c85db68499cd193d4904e3", "astute_sha": "7e6e6f9188bd69c603853b10d4a55149363323cc", "feature_groups": ["mirantis"], "release": "6.1", "fuelmain_sha": "", "fuellib_sha": "4d04e7bb0472225e7d9f1f782f0525c8dba8cf06"}}}, "auth_required": true, "api": "1.0", "nailgun_sha": "71cb1dc573103e0faa6f54be687dd9fba57f6c8c", "production": "docker", "python-fuelclient_sha": "521c2491f7f04f31d8c85db68499cd193d4904e3", "astute_sha": "7e6e6f9188bd69c603853b10d4a55149363323cc", "feature_groups": ["mirantis"], "release": "6.1", "fuelmain_sha": "", "fuellib_sha": "4d04e7bb0472225e7d9f1f782f0525c8dba8cf06"