Description of problem: stackrc file on the undercloud is missing:

# Clear any old environment that may conflict.
for key in $( set | awk '{FS="="}  /^OS_/ {print $1}' ); do unset $key ; done


Version-Release number of selected component (if applicable): 2018-08-23.3


How reproducible: 100%


Steps to Reproduce:
1. Deploy undercloud
2. Check stackrc file


Actual results:

This is the content of the stackrc file:

export OS_AUTH_TYPE=password
export OS_PASSWORD=glHB7RHJ7ERB6Uej8OO6LEk8c
export OS_AUTH_URL=https://192.168.24.2:13000/
export OS_USERNAME=admin
export OS_PROJECT_NAME=admin
export COMPUTE_API_VERSION=1.1
export NOVA_VERSION=1.1
export OS_NO_CACHE=True
export OS_CLOUDNAME=undercloud
# 1.34 is the latest API version in Ironic Pike supported by ironicclient
export IRONIC_API_VERSION=1.34
export OS_BAREMETAL_API_VERSION=$IRONIC_API_VERSION
export OS_IDENTITY_API_VERSION='3'
export OS_PROJECT_DOMAIN_NAME='Default'
export OS_USER_DOMAIN_NAME='Default'
# Add OS_CLOUDNAME to PS1
if [ -z "${CLOUDPROMPT_ENABLED:-}" ]; then
    export PS1=${PS1:-""}
    export PS1=\${OS_CLOUDNAME:+"(\$OS_CLOUDNAME)"}\ $PS1
    export CLOUDPROMPT_ENABLED=1
fi
export PYTHONWARNINGS="ignore:Certificate has no, ignore:A true SSLContext object is not available"


Expected results:

Content should be like:

# Clear any old environment that may conflict.
for key in $( set | awk '{FS="="}  /^OS_/ {print $1}' ); do unset $key ; done
export OS_NO_CACHE=True
export COMPUTE_API_VERSION=1.1
export OS_USERNAME=admin
export no_proxy=,10.0.0.101,192.168.24.15
export OS_USER_DOMAIN_NAME=Default
export OS_VOLUME_API_VERSION=3
export OS_CLOUDNAME=overcloud
export OS_AUTH_URL=https://10.0.0.101:13000//v3
export NOVA_VERSION=1.1
export OS_IMAGE_API_VERSION=2
export OS_PASSWORD=yjMTkxnckxXtYqrEduJPTQRtq
export OS_PROJECT_DOMAIN_NAME=Default
export OS_IDENTITY_API_VERSION=3
export OS_PROJECT_NAME=admin
export OS_AUTH_TYPE=password
export PYTHONWARNINGS="ignore:Certificate has no, ignore:A true SSLContext object is not available"

# Add OS_CLOUDNAME to PS1
if [ -z "${CLOUDPROMPT_ENABLED:-}" ]; then
    export PS1=${PS1:-""}
    export PS1=\${OS_CLOUDNAME:+"(\$OS_CLOUDNAME)"}\ $PS1
    export CLOUDPROMPT_ENABLED=1
fi

Additional info:

overcloudrc still contains these lines as expected