In ideal system nothing should touch test devices, but to make tests
more robust, we should expect that something is still scanning devices
after activation. So replace all checks for CRYPT_ACTIVE to allow
also CRYPT_BUSY.
(Fixes some problems seen in #633)
This patch duplicates part of the code because following
switch to non-recursive automake is not easily fixable without this change.
(Automake cannot use top_srcdir anymore in this context.)
