Revert "Temporary unlock gate tests for salt formulas"

This reverts commit b8dc9ed3145922968b303e9bd12e0b1246d4054a.

Reason for revert: Proper workaround required, more than one spot

PROD-35466
Change-Id: Ie0ae70edc0519937d1680c9db6e0c2a153a8eb03
diff --git a/test-salt-formulas-pipeline.groovy b/test-salt-formulas-pipeline.groovy
index e84386a..640cfed 100644
--- a/test-salt-formulas-pipeline.groovy
+++ b/test-salt-formulas-pipeline.groovy
@@ -14,9 +14,7 @@
 def gerritRef = env.GERRIT_REFSPEC ?: null
 def defaultGitRef = env.DEFAULT_GIT_REF ?: null
 def defaultGitUrl = env.DEFAULT_GIT_URL ?: null
-// vkhlyunev: New slaves breaks old jobs, sticking to ols slaves until fixed
-//def slaveNode = env.SLAVE_NODE ?: 'virtual'
-def slaveNode = env.SLAVE_NODE ?: 'old16.04'
+def slaveNode = env.SLAVE_NODE ?: 'virtual'
 def saltVersion = env.SALT_VERSION ?: ""
 
 gerritBranch = 'master'