[WIP] Encryption of SecureMgr

[MoonkiHong]

Originally posted by @tdrozdovsky in #131 (comment)

I personally think that sensitive data is returned by an access to passPhraseJWTPath. What do you think? @tdrozdovsky

edge-home-orchestration-go/src/controller/securemgr/authenticator/authenticator.go

Line 70 in 22ce49b

log.Panicf("Failed to create passPhraseJWTPath %s: %s\n", passPhraseJWTPath, err)

This might be the same potential security risk as follow.

edge-home-orchestration-go/src/controller/securemgr/authenticator/authenticator.go

Line 84 in 22ce49b

log.Println(logPrefix, "cannot create "+passPhraseJWTFilePath+": ", err)

Good point, I know and remember this security issue.

These only informs about a failed attempt to create the passPhraseJWTFilePath file.
But of course, storing such information in files (passPhrase, edge-orchestration.key, etc) is a security risk.
I think in the future this should be solved with secure storage or with access control system such as: SeLinux, SMACK, etc.

Thank you for reminder