journal: refactored boostrap changeset handling

See merge request !791

Remove inconsistent and unnecessary quoting in log files

Closes #530

See merge request !790

conf: tiny error log fixup

See merge request !787

dnssec: minor fix of rollover logging

See merge request !788

kjournalprint: separated changeset print routine to allow use for debug

See merge request !786

mempattern: correct api usage on several places

See merge request !785

journal: removed already bad check

See merge request !783

keymgr: run as user/group set in the config

See merge request !734

journal: handling possible error state in changeset_to_contents

See merge request !782

Journal bootstrap evolution

See merge request !750

Mempool metadata sanitizing

See merge request !781

 - discontinuity handling
 - duplicitiy of serials
 - delete subsequent changes if overwriting bootstrap

 - including the changes in ixfr-from-differences, better handling unchanged SOA
 - breaking the tests-extra/zone/reload test because it tries changed zone with unchanged SOA

Fix the CentOS locale issues by just changing the locale to C

See merge request !780

Use custom docker configuration for each GitLab CI job to prevent concurrent overwrites between the image building jobs

Keymgr:  various fixes

See merge request !779