Properly initialize obfusication in test suite

[mths1]

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[ioolkos]

@mths1 Awesome, thanks!

Incidentally, regarding gen_connect in both parsers (v4 and v5): I don't think we should obfuscate the password in the generation of the test packet already.

vernemq/apps/vmq_commons/src/vmq_parser_mqtt5.erl

Line 817 in c8df096

password = credentials_obfuscation:encrypt(

We simply want to generate those CONNECT packets as if a client would send it. (unless I miss a point?)
EDIT: pushed a commit for above.