Generating kubespec in case file is absent yet

When the rally pod is created, the /artifacts/kubespec_generated.yaml
file is not created yet, so the "bash /artifacts/rally-files/init-rally.sh"
cannot create the second ("kubernetes") env.
With this fix, if the kubespec file is absent, it is generated in /artifacts
directory where the certs and key files are also created.

Related-PROD: PROD-36128

Change-Id: Idf6840a602f2f2a88f09b6246d800640917f442a
diff --git a/k8s/rally-files/gen_kubespec.sh b/k8s/rally-files/gen_kubespec.sh
index 49b8082..08da401 100644
--- a/k8s/rally-files/gen_kubespec.sh
+++ b/k8s/rally-files/gen_kubespec.sh
@@ -1,5 +1,6 @@
 #!/bin/bash
 # files
+cd /artifacts
 ca_crt=$(pwd)/ca.crt
 client_crt=$(pwd)/client.crt
 client_key=$(pwd)/client.key