Merge #1810

1810: Prepare release branch r=tiagolobocastro a=openebs-ci

Automated changes by [create-pull-request](https://github.com/peter-evans/create-pull-request) GitHub action

Co-authored-by: pchandra19 <pchandra19@users.noreply.github.com>

Author: mayastor-bors

.gitmodules

@@ -1,8 +1,8 @@
 [submodule "spdk-rs"]
 	path = spdk-rs
 	url = ../spdk-rs.git
-	branch = develop
+	branch = release/2.8
 [submodule "utils/dependencies"]
 	path = utils/dependencies
 	url = ../mayastor-dependencies.git
-	branch = develop
+	branch = release/2.8