Merge remote-tracking branch 'teor/bug16115-minor-fixes'

changes/bug16115-NULL-getinfo-onions

changes/bug16115-init-var

changes/bug16115-signing-key-NULL-check

changes/bug16115-spawn-comment

changes/bug16115-undef-directive-in-macro

changes/bug16115-unused-find-cipher

src/common/compat_pthreads.c

src/common/tortls.c

src/or/control.c

src/or/rendcommon.c

src/or/routerkeys.c

src/test/test_util.c