add quote to values in /etc/sysconfig/atomic-openshift-node

[nak3]

In the containerized installation, values configured in
/etc/sysconfig/atomic-openshift-node are used as environmental
variables from EnvironmentFile= in
/etc/systemd/system/atomic-openshift-node.service. Therfore, if
configuration has multiple values with space like:

OPTIONS=--loglevel=3 --disable=proxy

importing the env variables fails. This patch add the double quote
("") to each variables.

You can reproduce the issue with following steps:

1. Setting In /etc/sysconfig/atomic-openshift-node

OPTIONS=--loglevel=3 --disable=proxy

2. import the env variables (and fail)

# source /etc/sysconfig/atomic-openshift-node
-bash: --disable=proxy: command not found

[openshift-ci-robot]

@nak3: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
ci/openshift-jenkins/logging	a541a6f	link	/test logging

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[nak3]

Sorry, the cause of issue is not the quotation, but this openshift/origin#17212 I'm closing this PR.