DAOS-13527 test: Support default tag assignment through Jenkinsfile

The test tags to use the functional test stages should be driven by the
method through which the user has started the build. If the build has
been built with parameters or started by a timer then the parameters of
that build should drive the test tag selection. If the user pushes a PR
then any tags defined via commit pragmas should be used followed by
the any build parameter tags.

Signed-off-by: Phil Henderson <phillip.henderson@intel.com>

Author: phender

vars/parseStageInfo.groovy

@@ -274,34 +274,42 @@ Map call(Map config = [:]) {
     }
 
     // Determine which tests tags to use
-    String tag
-    if (startedByUser() || startedByUpstream()) {
-      // Test tags defined by the build parameters override all other tags
-      tag = get_build_params_tags()
-    }
-    if (!tag && startedByTimer()) {
-      // Stage defined tags take precedence in timed builds
-      tag = config['test_tag']
-      if (!tag) {
-        // Otherwise use the default timed build tags
-        tag = 'pr daily_regression'
-        if (env.BRANCH_NAME.startsWith('weekly-testing')) {
-          tag = 'full_regression'
+    //                   config        Build Param    Commit Pragma
+    // Started by        'test_tag'    (TestTag)      (Test-tag)       Default       Use
+    // --------------    ----------    ----------     -------------    ----------    ----------
+    // PR | Upstream     None          None           None             defaul_tag    defaul_tag
+    // PR | Upstream     None          None           commit_tag       defaul_tag    commit_tag
+    // PR | Upstream     None          param_tag      None             defaul_tag    param_tag
+    // PR | Upstream     None          param_tag      commit_tag       defaul_tag    commit_tag
+    // Manual | Timer    None          None           <any>            defaul_tag    defaul_tag
+    // Manual | Timer    None          param_tag      <any>            defaul_tag    param_tag
+    // <any>             config_tag    <any>          <any>            <any>         config_tag
+    //
+    String tag = config['test_tag']
+    if (!tag) {
+      if (startedByUser() || startedByTimer()) {
+        // Get tags from the build parameters
+        tag = get_build_params_tags()
+        if (!tag) {
+          // Default to the pr tag for any other build stage
+          tag = 'pr'
         }
       }
-    } else if (!tag) {
-      if (env.BRANCH_NAME.matches(testBranchRE())) {
-        tag = 'always_passes'
-      } else {
-        // Tags defined by commit pragmas have priority in user PRs
+      else {
+        // Get tags from the commit pragmas
         tag = get_commit_pragma_tags(result['pragma_suffix'])
         if (!tag) {
-          // Followed by stage defined tags
-          tag = config['test_tag']
-          /* groovylint-disable-next-line CouldBeElvis */
+          // Get tags from the build parameters
+          tag = get_build_params_tags()
           if (!tag) {
-            // Otherwise use the default PR tag
-            tag = 'pr'
+            if (startedByUpstream()) {
+              // Default to run simple tests for dowstream builds
+              tag = 'always_passes'
+            }
+            else {
+              // Default to the pr tag for any other build stage
+              tag = 'pr'
+            }
           }
         }
       }