Release 0.21.0

Semantic now Required for policies (BREAKING CHANGE)

Previouxly semantic was optional when creating or updating policies (POST or PUT), defaulting to AllOf when not specified. It is now required.

Bug fix: Using PUT for policies without including the semantic would cause them to be evaluated using the AllOf semantic
Bug fix: Additional concurrency fix in posture data
Feature: Ziti CLI now supports a comprehensive set of ca and cas options
Feature: ziti ps now supports set-channel-log-level and clear-channel-log-level operations
Change: Previouxly semantic was optional when creating or updating policies (POST or PUT), defaulting to AllOf when not specified. It is now required.