RFE: add check to openshift installer to validate certificate expiriation

[xtophd]

the openshift installer should exit if an expired cert is detected.

This would allow for the removal of the "lock" mechanism and simplify iterative deployment attempts.
Would also remove confusion of when to run "unlock". Error messaging is clear and mitigations identified.

installer begins

if openshift installation artifacts exist; then
do not re-run install
else
run install
endif

if install-cert expired; then
error message "Certificate has expired"
hint messages "Run deployer with 'clean' option and try again" step (not yet implemented)
exit
fi

proceed with install