Change log4j12 to reload4j (#84)

reload4j is a drop-in replacement for log4j 1.2.17

The binary compatibility issue [0] between earlier versions of reload4j
and slf4j-log4j12 has been fixed.
Although it is recommended that you use slf4j-reload4j as the preferred
adapter for the slf4j/reload4j combination, with reload4j version 1.2.21
and later you can freely mix any version of slf4j-log4j12, if you have to.

From Docker:
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/src/openseedbox/lib/slf4j-reload4j-1.7.36.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/play/framework/lib/slf4j-log4j12-1.7.22.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Reload4jLoggerFactory]

[0]: qos-ch/reload4j#41

conf/dependencies.yml

@@ -1,10 +1,16 @@
 # Application dependencies
 
 require:
-    - play [1.3.4,1.5[
+    - play [1.3.4,1.5[:
+        exclude:
+            - log4j -> *
+            - org.slf4j -> slf4j-log4j12
     - play -> siena 2.0.7:
         transitive: false
     - openseedbox-common -> openseedbox-common latest.integration
+    - ch.qos.reload4j -> reload4j [1.2.21,2[:
+        transitive: false
+    - org.slf4j -> slf4j-reload4j [1.7.0,2[
     - org.postgresql -> postgresql 42.3.4:
         force: true