Fix "options are only allowed before install arguments" error.
Fix "options are only allowed before install arguments" error.

This reverts feb748f488 and 7cd7077467. `bootstrap_options` is
meant for flag options such as `-D`. This is demonstrated in the
example Vagrantfile from the original plugin:
github.com/saltstack/salty-vagrant/blob/develop/example/complete/Vagrantfile
Flag options must be appended to the options string before install
args such as `install_type` and `install_args`.

dustymabe/vagrant,Sgoettschkes/vagrant,fnewberg/vagrant,chrisvire/vagrant,mwarren/vagrant,chrisvire/vagrant,kamazee/vagrant,doy/vagrant,bdwyertech/vagrant,invernizzi-at-google/vagrant,jean/vagrant,mpoeter/vagrant,philwrenn/vagrant,dhoer/vagrant,blueyed/vagrant,channui/vagrant,tbarrongh/vagrant,chrisvire/vagrant,tomfanning/vagrant,nickryand/vagrant,myrjola/vagrant,mwarren/vagrant,bryson/vagrant,darkn3rd/vagrant,tomfanning/vagrant,jkburges/vagrant,pwnall/vagrant,stephancom/vagrant,philoserf/vagrant,ferventcoder/vagrant,PatOShea/vagrant,genome21/vagrant,ArloL/vagrant,clinstid/vagrant,BlakeMesdag/vagrant,janek-warchol/vagrant,fnewberg/vagrant,jberends/vagrant,shtouff/vagrant,johntron/vagrant,wkolean/vagrant,benizi/vagrant,mwarren/vagrant,ferventcoder/vagrant,TheBigBear/vagrant,taliesins/vagrant,dhoer/vagrant,tbarrongh/vagrant,jhoblitt/vagrant,mwrock/vagrant,legal90/vagrant,nickryand/vagrant,tknerr/vagrant,h4ck3rm1k3/vagrant,pwnall/vagrant,Sgoettschkes/vagrant,pwnall/vagrant,mwrock/vagrant,gitebra/vagrant,carlosefr/vagrant,dhoer/vagrant,juiceinc/vagrant,patrys/vagrant,gpkfr/vagrant,wkolean/vagrant,philoserf/vagrant,bheuvel/vagrant,pwnall/vagrant,justincampbell/vagrant,obnoxxx/vagrant,benizi/vagrant,tschortsch/vagrant,aaam/vagrant,loren-osborn/vagrant,bdwyertech/vagrant,h4ck3rm1k3/vagrant,wkolean/vagrant,TheBigBear/vagrant,justincampbell/vagrant,kamigerami/vagrant,miguel250/vagrant,patrys/vagrant,bshurts/vagrant,Endika/vagrant,tschortsch/vagrant,johntron/vagrant,rivy/vagrant,jfchevrette/vagrant,benh57/vagrant,zsjohny/vagrant,benh57/vagrant,jkburges/vagrant,bdwyertech/vagrant,jtopper/vagrant,p0deje/vagrant,bheuvel/vagrant,marxarelli/vagrant,MiLk/vagrant,tbriggs-curse/vagrant,philoserf/vagrant,jean/vagrant,Sgoettschkes/vagrant,carlosefr/vagrant,sax/vagrant,carlosefr/vagrant,aneeshusa/vagrant,invernizzi-at-google/vagrant,nickryand/vagrant,tbriggs-curse/vagrant,PatOShea/vagrant,jtopper/vagrant,patrys/vagrant,lonniev/vagrant,dharmab/vagrant,jfchevrette/vagrant,legal90/vagrant,teotihuacanada/vagrant,teotihuacanada/vagrant,muhanadra/vagrant,kalabiyau/vagrant,tjanez/vagrant,mpoeter/vagrant,PatOShea/vagrant,darkn3rd/vagrant,evverx/vagrant,gbarberi/vagrant,doy/vagrant,BlakeMesdag/vagrant,clinstid/vagrant,vamegh/vagrant,aneeshusa/vagrant,bryson/vagrant,blueyed/vagrant,krig/vagrant,tknerr/vagrant,ArloL/vagrant,rivy/vagrant,lonniev/vagrant,blueyed/vagrant,sideci-sample/sideci-sample-vagrant,obnoxxx/vagrant,sni/vagrant,jtopper/vagrant,carlosefr/vagrant,bheuvel/vagrant,tjanez/vagrant,lukebakken/vagrant,mkuzmin/vagrant,h4ck3rm1k3/vagrant,gpkfr/vagrant,shtouff/vagrant,taliesins/vagrant,jhoblitt/vagrant,genome21/vagrant,petems/vagrant,modulexcite/vagrant,MiLk/vagrant,gitebra/vagrant,Chhed13/vagrant,Endika/vagrant,petems/vagrant,krig/vagrant,kamazee/vagrant,lonniev/vagrant,chrisroberts/vagrant,miguel250/vagrant,crashlytics/vagrant,bryson/vagrant,doy/vagrant,invernizzi-at-google/vagrant,taliesins/vagrant,theist/vagrant,kamigerami/vagrant,benh57/vagrant,darkn3rd/vagrant,jfchevrette/vagrant,mkuzmin/vagrant,aneeshusa/vagrant,gpkfr/vagrant,muhanadra/vagrant,PatrickLang/vagrant,genome21/vagrant,teotihuacanada/vagrant,apertoso/vagrant,gbarberi/vagrant,PatrickLang/vagrant,lukebakken/vagrant,invernizzi-at-google/vagrant,benizi/vagrant,otagi/vagrant,theist/vagrant,Chhunlong/vagrant,senglin/vagrant,shtouff/vagrant,aneeshusa/vagrant,Endika/vagrant,aaam/vagrant,marxarelli/vagrant,ArloL/vagrant,mkuzmin/vagrant,mpoeter/vagrant,wangfakang/vagrant,marxarelli/vagrant,evverx/vagrant,mitchellh/vagrant,zsjohny/vagrant,marxarelli/vagrant,lukebakken/vagrant,wangfakang/vagrant,mitchellh/vagrant,jkburges/vagrant,gbarberi/vagrant,benizi/vagrant,Avira/vagrant,sideci-sample/sideci-sample-vagrant,philoserf/vagrant,TheBigBear/vagrant,philwrenn/vagrant,Chhed13/vagrant,myrjola/vagrant,sax/vagrant,senglin/vagrant,otagi/vagrant,mkuzmin/vagrant,petems/vagrant,jmanero/vagrant,chrisroberts/vagrant,sni/vagrant,Sgoettschkes/vagrant,tbarrongh/vagrant,ferventcoder/vagrant,denisbr/vagrant,bshurts/vagrant,chrisvire/vagrant,otagi/vagrant,jberends/vagrant,dhoer/vagrant,lonniev/vagrant,wangfakang/vagrant,theist/vagrant,miguel250/vagrant,Avira/vagrant,evverx/vagrant,PatOShea/vagrant,dustymabe/vagrant,jtopper/vagrant,dharmab/vagrant,iNecas/vagrant,modulexcite/vagrant,jmanero/vagrant,gpkfr/vagrant,modulexcite/vagrant,dustymabe/vagrant,tschortsch/vagrant,benh57/vagrant,sax/vagrant,jmanero/vagrant,myrjola/vagrant,signed8bit/vagrant,stephancom/vagrant,dharmab/vagrant,johntron/vagrant,PatrickLang/vagrant,mwrock/vagrant,Chhunlong/vagrant,ianmiell/vagrant,theist/vagrant,Chhed13/vagrant,PatrickLang/vagrant,jfchevrette/vagrant,chrisroberts/vagrant,senglin/vagrant,aaam/vagrant,sideci-sample/sideci-sample-vagrant,kamigerami/vagrant,kamigerami/vagrant,jkburges/vagrant,MiLk/vagrant,tschortsch/vagrant,tjanez/vagrant,ianmiell/vagrant,tomfanning/vagrant,bdwyertech/vagrant,jberends/vagrant,channui/vagrant,apertoso/vagrant,mwrock/vagrant,vamegh/vagrant,ianmiell/vagrant,jean/vagrant,p0deje/vagrant,tknerr/vagrant,mitchellh/vagrant,taliesins/vagrant,loren-osborn/vagrant,gbarberi/vagrant,cgvarela/vagrant,channui/vagrant,sni/vagrant,krig/vagrant,tjanez/vagrant,lukebakken/vagrant,genome21/vagrant,Avira/vagrant,crashlytics/vagrant,darkn3rd/vagrant,wkolean/vagrant,rivy/vagrant,philwrenn/vagrant,janek-warchol/vagrant,juiceinc/vagrant,mwarren/vagrant,bryson/vagrant,kalabiyau/vagrant,jmanero/vagrant,miguel250/vagrant,dharmab/vagrant,Avira/vagrant,signed8bit/vagrant,crashlytics/vagrant,muhanadra/vagrant,otagi/vagrant,sax/vagrant,ianmiell/vagrant,dustymabe/vagrant,legal90/vagrant,bheuvel/vagrant,justincampbell/vagrant,iNecas/vagrant,bshurts/vagrant,signed8bit/vagrant,modulexcite/vagrant,chrisroberts/vagrant,wangfakang/vagrant,gitebra/vagrant,Chhed13/vagrant,tomfanning/vagrant,fnewberg/vagrant,denisbr/vagrant,gitebra/vagrant,cgvarela/vagrant,patrys/vagrant,shtouff/vagrant,loren-osborn/vagrant,cgvarela/vagrant,zsjohny/vagrant,stephancom/vagrant,bshurts/vagrant,legal90/vagrant,Endika/vagrant,signed8bit/vagrant,gajdaw/vagrant,BlakeMesdag/vagrant,denisbr/vagrant,loren-osborn/vagrant,nickryand/vagrant,sni/vagrant,cgvarela/vagrant,vamegh/vagrant,janek-warchol/vagrant,gajdaw/vagrant,kamazee/vagrant,apertoso/vagrant,jhoblitt/vagrant,krig/vagrant,senglin/vagrant,apertoso/vagrant,tbriggs-curse/vagrant,justincampbell/vagrant,johntron/vagrant,kamazee/vagrant,crashlytics/vagrant,mpoeter/vagrant,muhanadra/vagrant,denisbr/vagrant,blueyed/vagrant,mitchellh/vagrant,stephancom/vagrant,clinstid/vagrant,tbarrongh/vagrant,tbriggs-curse/vagrant,aaam/vagrant,Chhunlong/vagrant,kalabiyau/vagrant,doy/vagrant,zsjohny/vagrant,tknerr/vagrant,jhoblitt/vagrant,teotihuacanada/vagrant,TheBigBear/vagrant,juiceinc/vagrant,ArloL/vagrant,rivy/vagrant,janek-warchol/vagrant,ferventcoder/vagrant,philwrenn/vagrant,vamegh/vagrant,fnewberg/vagrant,p0deje/vagrant,iNecas/vagrant,jean/vagrant,juiceinc/vagrant,myrjola/vagrant,h4ck3rm1k3/vagrant,obnoxxx/vagrant,petems/vagrant,Chhunlong/vagrant,gajdaw/vagrant,jberends/vagrant,kalabiyau/vagrant