Tracing wrapper implementation causes Jedis resource being destroyed when returning to pool.

[kasinskim]

Problem Description

Tracing wrapper implementation causes Jedis resource being destroyed when returning to pool.
When Jedis resource is destroyed socket associated with its client gets closed.
So, whenever you get instance from JedisPool, you get it in disconnected state - it is reconnecting any time you execute some action on it.

Consider test case scenario available in this PR:

 @Test
 public void shouldReturnResourceToThePoolOnCloseAndStayConnected() {
    //given
    JedisPool pool = new TracingJedisPool(new TracingConfiguration.Builder(mockTracer).build());
    Jedis resource = pool.getResource();
    assertTrue(resource.isConnected());

     //when
    resource.close();

     //then
    assertTrue(resource.isConnected());
  }

Expected behavior

Jedis resource returned to pool should keep connection open for at least BaseGenericObjectPool#getMinEvictableIdleTimeMillis (by default 60 seconds)

Changes introduced

• TracingJedisWrapper extends Jedis resource & decorates all its methods with tracing spans
• TracingJedis extends TracingJedisWrapper - so its public interface does not change
• Covering changes with test cases for both Jedis/Jedis3 implementations

[coveralls]

Pull Request Test Coverage Report for Build 177

• 35 of 2904 (1.21%) changed or added relevant lines in 5 files are covered.
• 36 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.7%) to 4.631%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
opentracing-redis-jedis/src/main/java/io/opentracing/contrib/redis/jedis/TracingJedis.java	1	19	5.26%
opentracing-redis-jedis3/src/main/java/io/opentracing/contrib/redis/jedis3/TracingJedis.java	1	19	5.26%
opentracing-redis-jedis/src/main/java/redis/clients/jedis/TracingJedisWrapper.java	29	2862	1.01%

Files with Coverage Reduction	New Missed Lines	%
opentracing-redis-jedis/src/main/java/io/opentracing/contrib/redis/jedis/TracingJedis.java	18	5.26%
opentracing-redis-jedis3/src/main/java/io/opentracing/contrib/redis/jedis3/TracingJedis.java	18	5.26%

Totals
Change from base Build 176:	0.7%
Covered Lines:	1018
Relevant Lines:	21984

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💛 - Coveralls