ext-plugins/lib-general: string_{list,set} + conversion filter

+ start respective unit tests
+ fix faulty format passing logic as observed with the new plugins

Signed-off-by: Jan Pokorný <jpokorny@redhat.com>
formats/command: move to ext-plugins/lib-general/formats

Signed-off-by: Jan Pokorný <jpokorny@redhat.com>
New ext-plugins/lib-general/filters/pkgs2{distropkgs,installcmd}

Signed-off-by: Jan Pokorný <jpokorny@redhat.com>
New ext-plugins/lib-pcs/filters/pcs-resource

...filter to find out required logical packages as per the CIB
(known configured resources).

Signed-off-by: Jan Pokorný <jpokorny@redhat.com>
New ext-plugins/lib-pcs/commands/pcs-rsc-deps

...command to output command to install required logical packages
as per the CIB (known configured resources).

Signed-off-by: Jan Pokorný <jpokorny@redhat.com>
filters/pkgs2installcmd: more logical to stick w/ command fmt

Signed-off-by: Jan Pokorný <jpokorny@redhat.com>