chore: update e2e-fio

Regularise command enum members (do not mix with #defines)
Update comments in e2e-fio.c for clarity
Updated readme
bump version number as code has changed a tuiny bit

Change symbol KW_MAKEFILE to KW_CREATEFILE
the string associated with the symbol will be retained
as "makefile"

e2e-fio image with new tag does not exist,
so CI will not pass.
A future change will bump the e2e-fio tag,
after the image has been pushed to docker hub

Signed-off-by: Blaise Dias <[email protected]>

Author: Blaise Dias

tools/e2e-fio/README.md

@@ -1,6 +1,11 @@
-# Mayastor E2E fio test pod
+# Mayastor E2E fio test pod image
 ## Introduction
-Derived from `dmonakhov/alpine-fio`
+This image is derived from `alpine`
+
+It includes fio, which is invoked by the wrapper program `e2e_fio`
+
+e2e_fio is written in C to facilitate low level control and to keep the size small.
+Reduced size makes it possible to run more instances of the test pod with a given memory constraint.
 
 ### Command line options
  * `sleep <sleep seconds> ;`
@@ -41,8 +46,6 @@ Thus allows developer to exec a shell on the pod and examine the pod.
 
 Execution will only complete after all forked processes (if any) have completed as well as inline sleep and signal generation actions.
 
-For legacy compatibility where implicit start of a new option is detected
-
 ### Exit value
  * If `exitv` is specified that is *always* returned.
  * 0 if all instances of forked processes ran successfully exit value is 0

tools/e2e-fio/build.sh

@@ -11,7 +11,7 @@
 # existing semantics.
 set -e
 IMAGE="openebs/e2e-fio"
-TAG="v3.38-e2e-0"
+TAG="v3.38-e2e-1"
 registry=""
 tag_as_latest=""