added an enviroment variable for balance alg. and ability to disable route cookies
added an enviroment variable for balance alg. and ability to disable
route cookies

added ROUTER_DEFAULT_BALANCE which allows the default balance algorithm
for edge and reencrypt routes to be set for the cluster

added annotation haproxy.router.openshift.io/use_cookies which when set
to false | FALSE omits the creation of a cookie so the balance algorithm
is used to determine endpoints everytime a request is made.

changelog:
- changed the name of the annotation haproxy.router.openshift.io/use_cookies to haproxy.router.openshift.io/disable_cookies
- change env variable ROUTER_DEFAULT_LOAD_BALANCE to ROUTER_LOAD_BALANCE_ALGORITHM

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