plugin/pprof - add option to enable block profiling (#2729)

* - add an option for block profiling to plugin pprof

* - move option block into nested block

plugin/pprof/setup_test.go

@@ -14,11 +14,21 @@ func TestPProf(t *testing.T) {
 		{`pprof`, false},
 		{`pprof 1.2.3.4:1234`, false},
 		{`pprof :1234`, false},
-		{`pprof {}`, true},
+		{`pprof :1234 -1`, true},
+		{`pprof {
+                }`, false},
 		{`pprof /foo`, true},
 		{`pprof {
             a b
         }`, true},
+		{`pprof { block
+                }`, false},
+		{`pprof :1234 { 
+                   block 20
+                }`, false},
+		{`pprof { 
+                   block 20 30
+                }`, true},
 		{`pprof
           pprof`, true},
 	}