* - support wildcards for namespaces
* do not annotate resource, unless policy is an autogen policy
* close HTTP body
* improve messages
* remove policy store
Policy store was not fully implemented and simply provided a way
to list all polices and get a policy by name, which can be done via
standard client-go interfaces.
We need to revisit and design a better PolicyStore that provides fast
lookups for matching policies based on names, namespaces, etc.
* handle wildcard namespaces in background processing
* fix unit tests 1) remove platform dependent path usage 2) remove policy store
* add test case for mutate with wildcard namespaces
* init container to cleanup stale webhook configurations if any.
* remove test code
* use internal pkg for os signals
* move webhook cleanup before http.server shutown.
* update make file and remove init
* update CI script
