Add allow-insecure and deny-insecure server flags

[nacfe]

Change list

• Add allow-insecure server flag.
• Add deny-insecure server flag.

Types of changes

What types of changes are you proposing/introducing to Java client?
Put an x in the boxes that apply

• No changes in production code.
• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

[nacfe]

@mykola-mokhnach There was indeed a mismatch between my local git config's email and username and those on github. Thanks for the help and sorry for the mess.

[saikrishna321]

Thanks for PR @nacfe 👍