[SER-2846] Randomly generate the default secret key#7405

cihadtekin merged 3 commits intomasterCountly/countly-server:masterfrom

SER-2846-reported-vulnerability-for-the-hardcoded-default-secret-key-in-reportsCountly/countly-server:SER-2846-reported-vulnerability-for-the-hardcoded-default-secret-key-in-reportsCopy head branch name to clipboard