Remove remaining C stub files

Signed-off-by: Mike McClurg <mike.mcclurg@citrix.com>
Handle getpwnam/getpwuid/getspnam with non-existant user

Signed-off-by: Mike McClurg <mike.mcclurg@gmail.com>
Make extra debugging optional with CONFIG=--enable-extra-debugging

Signed-off-by: Mike McClurg <mike.mcclurg@gmail.com>
Fix test_chspwd test case

Signed-off-by: Mike McClurg <mike.mcclurg@gmail.com>