Fix test breakages on Gerrit master

Avoid using the JUnit method name which is now ending
with the '[default]' suffix added to all tests after the merging
of I92c2f633 into Gerrit master branch. Using System.nanoTime()
provides the same results of having different cache names
and is more resilient against future changes on the Gerrit
test infrastructure.

Also remove the assumption on the actual cache initial
stats that could vary between Gerrit releases, as they did
as a indirect consequence of I70c3b0a708d.

Change-Id: I071cdcec5b1224974ce638fad58cba244fc31e2c

src/test/java/com/googlesource/gerrit/modules/cache/chroniclemap/AnalyzeH2CachesIT.java

diff --git a/src/test/java/com/googlesource/gerrit/modules/cache/chroniclemap/AnalyzeH2CachesIT.java b/src/test/java/com/googlesource/gerrit/modules/cache/chroniclemap/AnalyzeH2CachesIT.java
index 7c55849..7ac52f3 100644
--- a/src/test/java/com/googlesource/gerrit/modules/cache/chroniclemap/AnalyzeH2CachesIT.java
+++ b/src/test/java/com/googlesource/gerrit/modules/cache/chroniclemap/AnalyzeH2CachesIT.java
@@ -47,11 +47,11 @@
     String result = adminSshSession.exec(cmd);
 
     adminSshSession.assertSuccess();
-    assertThat(result).contains("[cache \"git_file_diff\"]\n" + "\tmaxEntries = 1\n");
-    assertThat(result).contains("[cache \"gerrit_file_diff\"]\n" + "\tmaxEntries = 2\n");
-    assertThat(result).contains("[cache \"accounts\"]\n" + "\tmaxEntries = 4\n");
-    assertThat(result).contains("[cache \"diff_summary\"]\n" + "\tmaxEntries = 1\n");
-    assertThat(result).contains("[cache \"persisted_projects\"]\n" + "\tmaxEntries = 3\n");
+    assertThat(result).contains("[cache \"git_file_diff\"]");
+    assertThat(result).contains("[cache \"gerrit_file_diff\"]");
+    assertThat(result).contains("[cache \"accounts\"]");
+    assertThat(result).contains("[cache \"diff_summary\"]");
+    assertThat(result).contains("[cache \"persisted_projects\"]");
   }
 
   @Test

src/test/java/com/googlesource/gerrit/modules/cache/chroniclemap/ChronicleMapCacheExtendedIT.java

diff --git a/src/test/java/com/googlesource/gerrit/modules/cache/chroniclemap/ChronicleMapCacheExtendedIT.java b/src/test/java/com/googlesource/gerrit/modules/cache/chroniclemap/ChronicleMapCacheExtendedIT.java
index 6fec793..4735477 100644
--- a/src/test/java/com/googlesource/gerrit/modules/cache/chroniclemap/ChronicleMapCacheExtendedIT.java
+++ b/src/test/java/com/googlesource/gerrit/modules/cache/chroniclemap/ChronicleMapCacheExtendedIT.java
@@ -77,7 +77,7 @@
   @Override
   protected void beforeTest(Description description) throws Exception {
     super.beforeTest(description);
-    testCacheName += description.getMethodName();
+    testCacheName += System.nanoTime();
   }
 
   @Test