Goal: change the way how passwords are provided to keystore and truststore from ENV variables/hardcoded defaults to files with passwords

CoS:

properties which holds information about passwords changed from plain strings to paths
defaults:
keystore - /app/store/p12.pass
truststore - /app/store/trust.pass
PNF simulator code adjusted to read passwords from files
for local deployments files with hardcoded passwords provided
automatic ways to start PNF simulator adjusted to not provide extra ENV variables

R&D info:

changes are needed in all files which hold CLIENT_CERT_PASS variable and in SslAuthenticationHelper