sssctl: Flags for command initialization Allow passing flags for command specific initialization. Currently only one flag is available to skip the confdb initialization which is required to improve config-check command. Resolves: https://fedorahosted.org/sssd/ticket/3209 Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>

tools: Add missing gettext macro The message in SSS_TOOL_DELIMITER should be translated. Reviewed-by: Petr Čech <pcech@redhat.com>

sssctl: Consistent commands naming Use TOPIC-ACTION pattern for sssctl command names. Resolves: https://fedorahosted.org/sssd/ticket/3087 Reviewed-by: Pavel Březina <pbrezina@redhat.com> Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>

TOOLS: Some tools command might not need initialization to succeed Since we want to use the sssctl tool during upgrade, we need to amend the tools initialization code to not error out if sysdb can't be instantiated, but rather return errno and let the tool handle the error. Each tool command now has a 'allowed errno' the command is able to handle. In this patch iteration, only a single errno can be handled and only the upgrade command is able to do so. Reviewed-by: Sumit Bose <sbose@redhat.com>

sss_tools: return errno_t instead of system code Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>

sss_tools: add commands delimiter Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>

sss_tools: tell whether an option was provided Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>

sss_tools: add command description Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>

TOOLS: add common command framework Add general framework to simplify creating "cmd COMMAND [OPTIONS...]" style tools. Preparation for: https://fedorahosted.org/sssd/ticket/2584 Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>