support '-' to indicate stdout in nova-manage project 'environment' and 'zip'
support '-' to indicate stdout in nova-manage project 'environment' and 'zip'

This just adds support to do:
  nova-manage project zip test-project admin - > out.zip
  nova-manage project environment test-project admin - | grep NOVA_URL

eayunstack/nova,yrobla/nova,cloudbase/nova-virtualbox,NoBodyCam/TftpPxeBootBareMetal,ewindisch/nova,sebrandon1/nova,bgxavier/nova,scripnichenko/nova,cyx1231st/nova,Yusuke1987/openstack_template,KarimAllah/nova,KarimAllah/nova,cernops/nova,Tehsmash/nova,houshengbo/nova_vmware_compute_driver,NeCTAR-RC/nova,salv-orlando/MyRepo,vladikr/nova_drafts,Juniper/nova,zzicewind/nova,dstroppa/openstack-smartos-nova-grizzly,shahar-stratoscale/nova,russellb/nova,josephsuh/extra-specs,aristanetworks/arista-ovs-nova,sridevikoushik31/nova,citrix-openstack-build/nova,jianghuaw/nova,NoBodyCam/TftpPxeBootBareMetal,petrutlucian94/nova_dev,devendermishrajio/nova_test_latest,hanlind/nova,rickerc/nova_audit,affo/nova,devendermishrajio/nova,whitepages/nova,usc-isi/nova,usc-isi/nova,gspilio/nova,rrader/nova-docker-plugin,NewpTone/stacklab-nova,vladikr/nova_drafts,petrutlucian94/nova,zaina/nova,tanglei528/nova,jianghuaw/nova,plumgrid/plumgrid-nova,sridevikoushik31/nova,redhat-openstack/nova,shail2810/nova,rajalokan/nova,double12gzh/nova,Metaswitch/calico-nova,yatinkumbhare/openstack-nova,cloudbase/nova-virtualbox,badock/nova,j-carpentier/nova,gooddata/openstack-nova,adelina-t/nova,NeCTAR-RC/nova,usc-isi/extra-specs,iuliat/nova,NewpTone/stacklab-nova,saleemjaveds/https-github.com-openstack-nova,JioCloud/nova_test_latest,russellb/nova,leilihh/novaha,apporc/nova,devoid/nova,angdraug/nova,psiwczak/openstack,affo/nova,cloudbase/nova,yosshy/nova,akash1808/nova_test_latest,savi-dev/nova,tealover/nova,ewindisch/nova,bigswitch/nova,dims/nova,felixma/nova,kimjaejoong/nova,eneabio/nova,SUSE-Cloud/nova,mandeepdhami/nova,jianghuaw/nova,cernops/nova,Francis-Liu/animated-broccoli,CEG-FYP-OpenStack/scheduler,CiscoSystems/nova,luogangyi/bcec-nova,rahulunair/nova,petrutlucian94/nova,vmturbo/nova,Triv90/Nova,eayunstack/nova,phenoxim/nova,sebrandon1/nova,phenoxim/nova,eonpatapon/nova,barnsnake351/nova,redhat-openstack/nova,shahar-stratoscale/nova,alvarolopez/nova,mahak/nova,eneabio/nova,virtualopensystems/nova,eonpatapon/nova,sacharya/nova,varunarya10/nova_test_latest,Juniper/nova,TwinkleChawla/nova,CiscoSystems/nova,Metaswitch/calico-nova,openstack/nova,tudorvio/nova,iuliat/nova,MountainWei/nova,josephsuh/extra-specs,yrobla/nova,akash1808/nova_test_latest,paulmathews/nova,klmitch/nova,Stavitsky/nova,JioCloud/nova,vmturbo/nova,dims/nova,kimjaejoong/nova,akash1808/nova,jeffrey4l/nova,mikalstill/nova,whitepages/nova,Yuriy-Leonov/nova,maheshp/novatest,maoy/zknova,josephsuh/extra-specs,mahak/nova,rajalokan/nova,virtualopensystems/nova,ted-gould/nova,paulmathews/nova,BeyondTheClouds/nova,gspilio/nova,noironetworks/nova,eharney/nova,alexandrucoman/vbox-nova-driver,shootstar/novatest,yosshy/nova,gooddata/openstack-nova,watonyweng/nova,adelina-t/nova,usc-isi/extra-specs,maelnor/nova,mmnelemane/nova,isyippee/nova,salv-orlando/MyRepo,leilihh/nova,JioCloud/nova,watonyweng/nova,mahak/nova,berrange/nova,Yuriy-Leonov/nova,tanglei528/nova,leilihh/novaha,joker946/nova,CCI-MOC/nova,Triv90/Nova,houshengbo/nova_vmware_compute_driver,takeshineshiro/nova,sridevikoushik31/nova,devendermishrajio/nova,takeshineshiro/nova,leilihh/nova,thomasem/nova,alexandrucoman/vbox-nova-driver,alaski/nova,salv-orlando/MyRepo,bclau/nova,vmturbo/nova,CloudServer/nova,maoy/zknova,sridevikoushik31/openstack,OpenAcademy-OpenStack/nova-scheduler,BeyondTheClouds/nova,tangfeixiong/nova,yrobla/nova,shootstar/novatest,cyx1231st/nova,blueboxgroup/nova,Brocade-OpenSource/OpenStack-DNRM-Nova,projectcalico/calico-nova,saleemjaveds/https-github.com-openstack-nova,gooddata/openstack-nova,imsplitbit/nova,sileht/deb-openstack-nova,felixma/nova,TieWei/nova,bgxavier/nova,rickerc/nova_audit,luogangyi/bcec-nova,sileht/deb-openstack-nova,eneabio/nova,Brocade-OpenSource/OpenStack-DNRM-Nova,fajoy/nova,aristanetworks/arista-ovs-nova,CloudServer/nova,SUSE-Cloud/nova,klmitch/nova,DirectXMan12/nova-hacking,Francis-Liu/animated-broccoli,j-carpentier/nova,qwefi/nova,dstroppa/openstack-smartos-nova-grizzly,belmiromoreira/nova,aristanetworks/arista-ovs-nova,mgagne/nova,yatinkumbhare/openstack-nova,klmitch/nova,Yusuke1987/openstack_template,DirectXMan12/nova-hacking,gspilio/nova,DirectXMan12/nova-hacking,CCI-MOC/nova,ntt-sic/nova,fnordahl/nova,belmiromoreira/nova,viggates/nova,akash1808/nova,isyippee/nova,JioCloud/nova_test_latest,bclau/nova,blueboxgroup/nova,silenceli/nova,openstack/nova,apporc/nova,citrix-openstack-build/nova,CEG-FYP-OpenStack/scheduler,Stavitsky/nova,zaina/nova,tianweizhang/nova,zhimin711/nova,cloudbase/nova,sridevikoushik31/openstack,alaski/nova,barnsnake351/nova,BeyondTheClouds/nova,tianweizhang/nova,NewpTone/stacklab-nova,tealover/nova,LoHChina/nova,maoy/zknova,cloudbase/nova,eharney/nova,paulmathews/nova,sridevikoushik31/openstack,rajalokan/nova,jianghuaw/nova,noironetworks/nova,fajoy/nova,orbitfp7/nova,berrange/nova,ruslanloman/nova,TwinkleChawla/nova,nikesh-mahalka/nova,zzicewind/nova,hanlind/nova,psiwczak/openstack,devoid/nova,klmitch/nova,orbitfp7/nova,MountainWei/nova,houshengbo/nova_vmware_compute_driver,edulramirez/nova,LoHChina/nova,TieWei/nova,russellb/nova,angdraug/nova,sacharya/nova,mandeepdhami/nova,silenceli/nova,psiwczak/openstack,scripnichenko/nova,qwefi/nova,fnordahl/nova,shail2810/nova,savi-dev/nova,usc-isi/extra-specs,tangfeixiong/nova,nikesh-mahalka/nova,fajoy/nova,joker946/nova,thomasem/nova,hanlind/nova,Tehsmash/nova,sileht/deb-openstack-nova,double12gzh/nova,maelnor/nova,maheshp/novatest,sridevikoushik31/nova,viggates/nova,sebrandon1/nova,savi-dev/nova,raildo/nova,petrutlucian94/nova_dev,zhimin711/nova,rahulunair/nova,Juniper/nova,mikalstill/nova,badock/nova,NoBodyCam/TftpPxeBootBareMetal,JianyuWang/nova,usc-isi/nova,tudorvio/nova,rahulunair/nova,devendermishrajio/nova_test_latest,Juniper/nova,ruslanloman/nova,JianyuWang/nova,ted-gould/nova,KarimAllah/nova,edulramirez/nova,mgagne/nova,cloudbau/nova,Triv90/Nova,alvarolopez/nova,projectcalico/calico-nova,jeffrey4l/nova,imsplitbit/nova,rajalokan/nova,cloudbau/nova,openstack/nova,dstroppa/openstack-smartos-nova-grizzly,varunarya10/nova_test_latest,raildo/nova,dawnpower/nova,vmturbo/nova,mmnelemane/nova,rrader/nova-docker-plugin,plumgrid/plumgrid-nova,spring-week-topos/nova-week,cernops/nova,maheshp/novatest,spring-week-topos/nova-week,mikalstill/nova,gooddata/openstack-nova,bigswitch/nova,ntt-sic/nova,OpenAcademy-OpenStack/nova-scheduler,dawnpower/nova