TT#44969 Do not pass RETRIEVE_MGMT_CONFIG to installer

In order to detect if it is necessary to run init or join actions
during the initial configuration JOIN_CLUSTER option is used so
there is no sense to pass RETRIEVE_MGMT_CONFIG to it.

Change-Id: I89c0bf9a96511b2de5e1bf53acd0f631a32f7429
(cherry picked from commit 2084d1d6c8)

templates/scripts/includes/deployment.sh

@@ -1549,7 +1549,6 @@ DEFAULT_INTERNAL_NETMASK="${DEFAULT_INTERNAL_NETMASK}"
 # Lets test we have INTERNAL_NETMASK==DEFAULT_INTERNAL_NETMASK for CE/PRO/Carrier (in installer)
 # and switch code to INTERNAL_NETMASK then.
 INTERNAL_NETMASK="${INTERNAL_NETMASK}"
-RETRIEVE_MGMT_CONFIG="${RETRIEVE_MGMT_CONFIG}"
 MANAGEMENT_IP="${MANAGEMENT_IP}"
 NGCP_PXE_INSTALL="${NGCP_PXE_INSTALL}"
 FILL_APPROX_CACHE="${FILL_APPROX_CACHE}"