Rename copyThroughCache to shouldCopyThroughCache

Sensible suggestion from Terry Parker as a late comment on
commit f2efcdc6f769d59722b17e9274932d585035cfb6.

Change-Id: I225775bfb6d3d91ae066ff00f9d80a9c02a422c2

org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsBlockCache.java

@@ -210,7 +210,7 @@ public final class DfsBlockCache {
 		statMiss = new AtomicLong();
 	}
 
-	boolean copyThroughCache(long length) {
+	boolean shouldCopyThroughCache(long length) {
 		return length <= maxStreamThroughCache;
 	}
 

org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/DfsPackFile.java

@@ -470,7 +470,7 @@ public final class DfsPackFile {
 			throws IOException {
 		MessageDigest md = initCopyPack(out, validate, ctx);
 		long p;
-		if (cache.copyThroughCache(length))
+		if (cache.shouldCopyThroughCache(length))
 			p = copyPackThroughCache(out, ctx, md);
 		else
 			p = copyPackBypassCache(out, ctx, md);