[PATCH]networking: Allow dot at the end of the domain name in dhcp response

[Balaji Punnuru]

When a dhcp server responds with a domain name that ends with a ".",
domain name validation is failing which leads to populating domain bad in
resolv.conf

Domain name ending with . is a valid syntax according RFC-1034.

The Patch fixes the domain name validation which ends with "."
The test results are as follows:

1. if DNS server returns with domain name "foo.test.com." , resolv.conf
gets populated with "domain foo.test.com."

2. if DNS server returns with domain name "foo.test.com" , resolv.conf gets
populated with "domain foo.test.com"

Without this Patch:
1. if DNS server returns with domain name "foo.test.com." , resolv.conf
gets populated with "domain bad <http://foo.test.com>"

2. if DNS server returns with domain name "foo.test.com" , resolv.conf gets
populated with "domain foo.test.com"
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