HHH-8302 init c3p0 initialPoolSize with minPoolSize

Adding C3P0_STYLE_INITIAL_POOL_SIZE directly to c3props doesn't work
because of prefix "c3p0."
Using setOverwriteProperty checks for the nullability of the value and
removes this prefix

Conflicts:
	hibernate-c3p0/src/main/java/org/hibernate/c3p0/internal/C3P0ConnectionProvider.java

Author: Laurent RICHARD

hibernate-c3p0/src/main/java/org/hibernate/service/jdbc/connections/internal/C3P0ConnectionProvider.java

@@ -188,7 +188,7 @@ public void configure(Map props) {
 			// unless otherwise specified with a c3p0.*-style parameter.
 			Integer initialPoolSize = ConfigurationHelper.getInteger( C3P0_STYLE_INITIAL_POOL_SIZE, props );
 			if ( initialPoolSize == null && minPoolSize != null ) {
-				c3props.put( C3P0_STYLE_INITIAL_POOL_SIZE, String.valueOf( minPoolSize ).trim() );
+				setOverwriteProperty( "", C3P0_STYLE_INITIAL_POOL_SIZE, props, c3props, minPoolSize );
 			}
 
 			/*DataSource unpooled = DataSources.unpooledDataSource(