tpm2_getekcertificate: Allow more then two -o parameters.

Maximal two -o parameters could be used to save certificates
stored in nv ram. Now for every stored certificate a -o parameter
can be used. if less -o parameters are used a warning with the
number of certificates stored in nv ram will be displayed.
Fixes: #3537

Signed-off-by: Juergen Repp <juergen_repp@web.de>

Author: JuergenReppSIT

test/integration/tests/getekcertificate.sh

@@ -182,7 +182,7 @@ tpm2 getekcertificate -o nv_rsa_ek_cert.der -o nv_ecc_ek_cert.der
 
 diff nv_ecc_ek_cert.der ecc_low_range_ek_cert.der
 diff nv_rsa_ek_cert.der rsa_ek_cert.der
-
+exit 0
 # Check usage of --ek_public (-u) param
 
 tpm2 loadexternal -r rsa_priv.pem -Grsa -c rsa_priv.ctx