Allow setting hive conf which doesn't have a hivevar (#39)

* Allow setting hive conf which doesn't have a hivevar
* Add changelog and unit test for setting hive conf

CHANGELOG.md

@@ -5,6 +5,9 @@
 - `hotels-oss-parent` version updated to `4.2.0` (was `4.1.0`).
 - Upgraded version of `hive.version` to `2.3.7` (was `2.3.4`). Allows BeeJU to be used on JDK>=9.
 
+### Added
+- Support for setting Hive conf using arbitrary string as conf key.
+
 ## [3.0.1] - 2019-09-27
 ### Changed
 - `HiveMetaStoreJUnitExtension` and `HiveServer2JUnitExtension` constructors made public to allow access to classes outside of the extensions package. 

src/main/java/com/hotels/beeju/core/BeejuCore.java

@@ -101,6 +101,10 @@ void setHiveVar(HiveConf.ConfVars variable, String value) {
     conf.setVar(variable, value);
   }
 
+  void setHiveConf(String variable, String value) {
+    conf.set(variable, value);
+  }
+
   void setHiveIntVar(HiveConf.ConfVars variable, int value) {
     conf.setIntVar(variable, value);
   }

src/test/java/com/hotels/beeju/core/BeejuCoreTest.java

@@ -77,6 +77,12 @@ public void setHiveVar() {
     assertThat(defaultCore.conf().getVar(HiveConf.ConfVars.METASTORECONNECTURLKEY), is("test"));
   }
 
+  @Test
+  public void setHiveConf() {
+    defaultCore.setHiveConf("my.custom.key", "test");
+    assertThat(defaultCore.conf().get("my.custom.key"), is("test"));
+  }
+
   @Test
   public void setHiveIntVar() {
     defaultCore.setHiveIntVar(HiveConf.ConfVars.HIVE_SERVER2_THRIFT_PORT, 00000);