testing: Reduce runtime of all tests that use SQLite databases by storing them in ramfs

testing/tests/tnc/tnccs-20-pts/hosts/moon/etc/strongswan.conf

@@ -17,7 +17,7 @@ charon {
 }
 
 libimcv {
-  database = sqlite:///etc/pts/config.db
+  database = sqlite:///etc/db.d/config.db
   policy_script = ipsec imv_policy_manager
   plugins {
     imv-attestation {
@@ -28,5 +28,5 @@ libimcv {
 
 attest {
   load = random nonce openssl sqlite
-  database = sqlite:///etc/pts/config.db
+  database = sqlite:///etc/db.d/config.db
 }