8213189: Make restricted headers in HTTP Client configurable and remove Date by default

src/java.base/share/conf/net.properties

...et.http/share/classes/jdk/internal/net/http/Exchange.java

...ttp/share/classes/jdk/internal/net/http/ExchangeImpl.java

...tp/share/classes/jdk/internal/net/http/Http1Exchange.java

...ttp/share/classes/jdk/internal/net/http/Http1Request.java

....net.http/share/classes/jdk/internal/net/http/Stream.java

...ttp/share/classes/jdk/internal/net/http/common/Utils.java

test/jdk/java/net/httpclient/RequestBuilderTest.java

test/jdk/java/net/httpclient/RestrictedHeadersTest.java

test/jdk/java/net/httpclient/SpecialHeadersTest.java

test/jdk/java/net/httpclient/security/16.policy

test/jdk/java/net/httpclient/security/17.policy

test/jdk/java/net/httpclient/security/Driver.java

test/jdk/java/net/httpclient/security/Security.java