* add namespace support for various tables

* add pid_with_namespace option to output

* fix logger related race conditions

* trying the _r versions from <pwd.h> to avoid needing a mutex.

* raii for buffers

* consistent fork safe logging

* move this to avoid a merge conflict

* update tests to use new interfaces

* add pid_with_namespace to groups table

* suggested improvements from @theopolis

* a few more syntax fixes