Testing: Ensure cat API REST tests are unaffected by randomization

The wildcard cat API REST tests relied on bulk.max and bulk.min in
the thread_pool response. However due to the thread pool types being
randomized in InternalTestCluster, the min/max values were not guaranteed
to exist (the cached thread pool type is unbounded and thus does not have a
max value).

In order to prevent this, the test has been removed and now the cat
nodes test is used for wildcard testing, which always returns stats
about the heap.

rest-api-spec/test/cat.nodes/10_basic.yaml

@@ -29,6 +29,16 @@
                /^      heap\.current          \s+  heap\.percent  \s+  heap\.max             \s+ \n
                   (\s+ \d+(\.\d+)?[ptgmk]?b   \s+  \d+            \s+  \d+(\.\d+)?[ptgmk]?b  \s+ \n)+  $/
 
+  - do:
+      cat.nodes:
+          h: heap.*
+          v: true
+
+  - match:
+      $body: |
+               /^      heap\.current          \s+  heap\.percent  \s+  heap\.max             \s+ \n
+                  (\s+ \d+(\.\d+)?[ptgmk]?b   \s+  \d+            \s+  \d+(\.\d+)?[ptgmk]?b  \s+ \n)+  $/
+
   - do:
       cat.nodes:
           h: file_desc.current,file_desc.percent,file_desc.max

rest-api-spec/test/cat.thread_pool/10_basic.yaml

@@ -29,18 +29,6 @@
                /  #pid       id          host       ip                          port
                ^  (\d+  \s+  \S{4}  \s+  \S+   \s+  (\d{1,3}\.){3}\d{1,3}  \s+  (\d+|-) \s+ \n)+  $/
 
-
-  - do:
-      cat.thread_pool:
-          h: bulk.m*
-
-  - match:
-      $body: |
-               /^ bulk.min  \s+  bulk.max \s+ \n
-                 (\s+  \d+  \s+  \d+  \s+ \n)+  $/
-
-#(\s+  \d+  \s+  \d+ \n)+  $/
-
   - do:
       cat.thread_pool:
           h: id,ba,fa,gea,ga,ia,maa,ma,oa,pa