Allow OVERRIDES variable value to contain ":" char

We want to overwrite pillar that contains url link to repo.
Right now tcp-qa templates uses ":" as split separator and url link
will break template render.

Change-Id: Id13c594b4bec94a5815824574c7e0fe281c64896
diff --git a/tcp_tests/templates/virtual-mcp-ocata-dvr/salt.yaml b/tcp_tests/templates/virtual-mcp-ocata-dvr/salt.yaml
index e7e32a6..97868d6 100644
--- a/tcp_tests/templates/virtual-mcp-ocata-dvr/salt.yaml
+++ b/tcp_tests/templates/virtual-mcp-ocata-dvr/salt.yaml
@@ -24,7 +24,7 @@
 
 {%- if OVERRIDES != '' %}
 {%- for param in OVERRIDES.splitlines() %}
-{%- set key, value = param.replace(' ','').split(':') %}
+{%- set key, value = param.replace(' ','').split(':', 1) %}
 - description: Override cluster parameters
   cmd: |
     salt-call reclass.cluster_meta_set name='{{ key }}' value='{{ value }}' file_name='{{OVERRIDES_FILENAME}}'