Fix a typo for environments error msg
Fix a typo for environments error msg

Fix a typo for environments error msg,
'alphanumericor' --> 'alphanumeric or'

Change-Id: I891231a2044e384554c029942bb15829fbfd1bfc

olivierlemasle/murano,satish-avninetworks/murano,openstack/murano,DavidPurcell/murano_temp,olivierlemasle/murano,satish-avninetworks/murano,satish-avninetworks/murano,DavidPurcell/murano_temp,NeCTAR-RC/murano,NeCTAR-RC/murano,olivierlemasle/murano,openstack/murano,DavidPurcell/murano_temp,NeCTAR-RC/murano,olivierlemasle/murano,NeCTAR-RC/murano,DavidPurcell/murano_temp,satish-avninetworks/murano