[fcos] openstack: remove "filesystem" from tf files

[vrutkovs]

This makes ignition files FCOS-compatible and should fix error during openstack install:

ERROR Error: Unsupported argument                  
ERROR                                              
ERROR   on ../../../../../tmp/openshift-install-117723343/masters/main.tf line 7, in data "ignition_file" "hostname": 
ERROR    7:   filesystem = "root"                  
ERROR                                              
ERROR An argument named "filesystem" is not expected here. 

[vrutkovs]

/cc @LorbusChris

[openshift-ci-robot]

@vrutkovs: The following tests failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
ci/prow/e2e-vsphere	08cd5eb	link	/test e2e-vsphere
ci/prow/e2e-aws	08cd5eb	link	/test e2e-aws

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[mandre]

/lgtm

[vrutkovs]

/override ci/prow/e2e-vsphere

known issues (#3013 addresses these)

[vrutkovs]

/override ci/prow/e2e-aws

known issues

[openshift-ci-robot]

@vrutkovs: Overrode contexts on behalf of vrutkovs: ci/prow/e2e-vsphere

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In response to this:

/override ci/prow/e2e-vsphere

known issues (#3013 addresses these)

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[openshift-ci-robot]

@vrutkovs: Overrode contexts on behalf of vrutkovs: ci/prow/e2e-aws

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In response to this:

/override ci/prow/e2e-aws

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[vrutkovs]

/approve

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: vrutkovs

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