test/integration: specify search directories for toggle_options.sh
test/integration: specify search directories for toggle_options.sh

If the directory is not specified, the current directory is taken
instead, which might e.g. be a build subdirectory not containing any
code at all. Use the already existing variables to locate the tools and
man page directories.

Signed-off-by: Jonas Witschel <87a164e5d00d5dcdd001e37b34ea8bcd3fc3a172@gmx.de>

01org/tpm2.0-tools,01org/tpm2.0-tools,01org/tpm2.0-tools