[compat] add private? and public? methods on PKey::EC

Author: kares

src/main/java/org/jruby/ext/openssl/PKeyEC.java

@@ -616,12 +616,12 @@ public IRubyObject set_private_key(final ThreadContext context, final IRubyObjec
         }
     }
 
-    @JRubyMethod(name = "public_key?")
+    @JRubyMethod(name = "public?", alias = "public_key?")
     public RubyBoolean public_p() {
         return publicKey != null ? getRuntime().getTrue() : getRuntime().getFalse();
     }
 
-    @JRubyMethod(name = "private_key?")
+    @JRubyMethod(name = "private?", alias = "private_key?")
     public RubyBoolean private_p() {
         return privateKey != null ? getRuntime().getTrue() : getRuntime().getFalse();
     }