CORDA-2187 & CORDA-2038: reverting maxTransactionSize <= maxMessageSize (#4166)

* CORDA-2187 reverting maxTransactionSize <= maxMessageSize

* Addressing review comments

* Increasing the maxTransactionSize for the Bootstrapper

* Updating the testNetworkParameters

node/src/test/kotlin/net/corda/node/internal/NetworkParametersTest.kt

@@ -76,19 +76,6 @@ class NetworkParametersTest {
         }
     }
 
-    @Test
-    fun `maxTransactionSize must be bigger than maxMesssageSize`() {
-        assertThatExceptionOfType(IllegalArgumentException::class.java).isThrownBy {
-            NetworkParameters(1,
-                    emptyList(),
-                    2000,
-                    2001,
-                    Instant.now(),
-                    1,
-                    emptyMap())
-        }.withMessage("maxTransactionSize cannot be bigger than maxMessageSize")
-    }
-
     @Test
     fun `package ownership checks are correct`() {
         val key1 = generateKeyPair().public