tree-wide: introduce disable_core_dumps helper and port existing users

Changes the core_pattern to prevent any core dumps by the kernel. Does
nothing if we're in a container environment as this is system wide
setting.

src/basic/util.h

@@ -191,3 +191,5 @@ int update_reboot_parameter_and_warn(const char *param);
 int version(void);
 
 int str_verscmp(const char *s1, const char *s2);
+
+void disable_core_dumps(void);