Make debuggerd enforcing.

Change-Id: If5b7206192cf93d9989b734304db0374429c04d5
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>

debuggerd.te

 # debugger interface
 type debuggerd, domain;
-permissive debuggerd;
 type debuggerd_exec, exec_type, file_type;
 
 init_daemon_domain(debuggerd)