openwisp / netjsonconfig / 587

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master: 99%

Pull #129

travis-ci

[openwrt] Allow configure DNS resolvers without defining an interfaces #117

Fixed the issue by defining two additional classes (DnsServer and
DnsSearch) in the interfaces
converter. These additional classes are to convert the dns configs when
an interface is not provided in the netjson. when an interface is provided, the default
converters in the Interface class is used to convert the dns to native
config. this was left so because when an interface is defined, other
options like DHCP servers might be available and the Interface class
handles that very well.
Test cases were added to test for these features and also to increase
the coverage.

Fixes #117

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1488 of 1489 relevant lines covered (99.93%)

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