* reduce matrix size
* add debug info to test script
* fix install line
* fix conditional openssl install
* move -x param in bash scripts
* parallel travis tests
* make coverage parallel as well
* fixup kcov to build tests
* include resolver in macOS and beta/nightly builds
* fix kcov scripts to script
* add coverage for all features
* remove rustls and native-tls from build for kcov
* merge test runs by feature and run kcov after all linux stable
* add individual test for mdns
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