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daemon: TLS-handshake timeout timer was not properly activated; fix

See merge request knot/knot-resolver!441

ci: add -Werror to CFLAGS, added clang build target

See merge request knot/knot-resolver!432

this checks things such as inconsistent declarations and definitions

This supports linting of C code using clang-tidy to fix common
security and code quality issues early in the development workflow.
The benefit is that less time has to be spent in code reviews to
point out obvious problems, and ideally when the outstanding issues
are fixed, clang-tidy (and clang-format) can also be used to to
automatically fix basic problems and enforce common code style,
similarly to `go vet && go fmt` workflow.

fixup! CI: add Clang scan-build to the pipeline

See merge request knot/knot-resolver!438

Forgot to `git add` Dockerfile with Clang tools.

Systemd modifications

See merge request knot/knot-resolver!436

Tomas Krizek authored Jan 11, 2018 and Petr Špaček committed Jan 11, 2018

The `knot-resolver` name is used for paths and user name. Creating a
systemd alias with the same name is user-friendly to end users who won't
have to remember another name (`kresd`).

Note: Systemd Alias is only created after service is enabled. Packagers
are thus advised to create symlinks for unit files during package installation
so users can use `knot-resolver` name right from the start.

Tomas Krizek authored Jan 11, 2018 and Petr Špaček committed Jan 11, 2018

The /run directory is non-persistent. Use /var/cache/knot-resolver
as a persistent cache.

CI: add Clan scan build to pipeline

See merge request knot/knot-resolver!437

For now error produced by scan-build are not fatal.
We need to fix these first.

systemd: drop WantedBy directive from kresd.service

See merge request knot/knot-resolver!433

This directive is unnecessary in the .service file, and it also causes
a dependency cycle that systemd is obliged to break.

Since kresd is socket-activated, there is no need for the WantedBy
directive in the .service file itself.  As long as the .socket files
are installed, the service will run when it is used.

systemd: enable manual activation of kresd.service as non-root user

See merge request knot/knot-resolver!434

To be able to bind to a well known port as a non-root user, the CAP_NET_BIND_SERVICE
capability is required.

outbound TCP connections sharing; TLS over outbound TCP connections

Closes #104

See merge request knot/knot-resolver!379