Allow 'vdc' to be invoked with logwrapper.

Currently vdc emits logs to stderr, which makes sense for command
line invocations, but when exec'ed they're silently dropped unless
the caller uses logwrapper.

avc: denied { read write } for path="/dev/pts/2" dev="devpts" ino=5 scontext=u:r:vdc:s0 tcontext=u:object_r:devpts:s0 tclass=chr_file permissive=0

Bug: 25796509
Change-Id: Ib92e0a7f580b1934a9853a83684f95b24bdc355c