do not prune anonymous password during support bundle generation

Download a support bundle from Nexus. When you try to access a booted Nexus using the support bundle config, anonymous user is always prompted to login.

The support bundle replaces the anonymous user password with **** which causes this. In order to replicate customer issues easier, it would be better if we leave the anonymous password alone since the anonymous user is a special internal user in Nexus and messing with the password is a bad idea. Also if customer ever changes the default password themselves, seeing the login prompt was a sign they messed with something they shouldn't.

See this in 2.7.2-03 generated bundles.