meta-integrity: avoid sstate issue due to exporting path variable
meta-integrity: avoid sstate issue due to exporting path variable

Exporting the path to the layer to shell scripts causes problems with
sstate (not reusable when changing the location of the layer) and also
(?) with prserver (version going backwards).

The variable was exported to simplify the manual creation of keys in a
devshell. The same effect can be achieved by adding the variable to
OE_TERMINAL_EXPORTS instead, which then does not affect builds.

Signed-off-by: Patrick Ohly <0fc9d825c622b2a5ac5160289c29f03654b10648@intel.com>

acornea/meta-intel-iot-security,acornea/meta-intel-iot-security,izaman/meta-intel-iot-security,01org/meta-intel-iot-security,acornea/meta-intel-iot-security,izaman/meta-intel-iot-security,izaman/meta-intel-iot-security,izaman/meta-intel-iot-security,acornea/meta-intel-iot-security,izaman/meta-intel-iot-security,01org/meta-intel-iot-security,acornea/meta-intel-iot-security,01org/meta-intel-iot-security,01org/meta-intel-iot-security