amp-form: allow xssi-prefix in email (#29480)
amp-form: allow xssi-prefix in email (#29480)

* amp-form: allow xssi-prefix in email

* alphabetize and add to the method=POST
Gregable/amphtml,media-net/amphtml,mhc-gh/amphtml,voyagegroup/amphtml,danielrozenberg/amphtml,zhouyx/amphtml,alanorozco/amphtml,jpettitt/amphtml,jridgewell/amphtml,nexxtv/amphtml,sharethrough/amphtml,adup-tech/amphtml,rsimha-amp/amphtml,zhouyx/amphtml,nexxtv/amphtml,zhouyx/amphtml,rsimha-amp/amphtml,media-net/amphtml,mhc-gh/amphtml,lannka/amphtml,Gregable/amphtml,mhc-gh/amphtml,mhc-gh/amphtml,smartadserver/amphtml,alanorozco/amphtml,nexxtv/amphtml,jpettitt/amphtml,honeybadgerdontcare/amphtml,Gregable/amphtml,mhc-gh/amphtml,Gregable/amphtml,jridgewell/amphtml,voyagegroup/amphtml,Gregable/amphtml,rsimha-amp/amphtml,jpettitt/amphtml,zhouyx/amphtml,ampproject/amphtml,adup-tech/amphtml,zhouyx/amphtml,nexxtv/amphtml,ampproject/amphtml,prateekbh/amphtml,voyagegroup/amphtml,prateekbh/amphtml,lannka/amphtml,danielrozenberg/amphtml,jmadler/amphtml,rsimha-amp/amphtml,honeybadgerdontcare/amphtml,honeybadgerdontcare/amphtml,jridgewell/amphtml,sharethrough/amphtml,danielrozenberg/amphtml,jridgewell/amphtml,lannka/amphtml,voyagegroup/amphtml,mhc-gh/amphtml,jpettitt/amphtml,jpettitt/amphtml,danielrozenberg/amphtml,voyagegroup/amphtml,ampproject/amphtml,prateekbh/amphtml,alanorozco/amphtml,nexxtv/amphtml,adup-tech/amphtml,media-net/amphtml,ampproject/amphtml,media-net/amphtml,nexxtv/amphtml,prateekbh/amphtml,zhouyx/amphtml,voyagegroup/amphtml,honeybadgerdontcare/amphtml,honeybadgerdontcare/amphtml,alanorozco/amphtml,rsimha-amp/amphtml,media-net/amphtml,lannka/amphtml,mhc-gh/amphtml,smartadserver/amphtml,danielrozenberg/amphtml,jmadler/amphtml,ampproject/amphtml,ampproject/amphtml,zhouyx/amphtml,jmadler/amphtml,danielrozenberg/amphtml,sharethrough/amphtml,voyagegroup/amphtml,smartadserver/amphtml,prateekbh/amphtml,Gregable/amphtml,prateekbh/amphtml,jridgewell/amphtml,smartadserver/amphtml,smartadserver/amphtml,jmadler/amphtml,rsimha-amp/amphtml,adup-tech/amphtml,lannka/amphtml,sharethrough/amphtml,danielrozenberg/amphtml,jpettitt/amphtml,prateekbh/amphtml,alanorozco/amphtml,honeybadgerdontcare/amphtml,media-net/amphtml,jmadler/amphtml,ampproject/amphtml,alanorozco/amphtml,jpettitt/amphtml,lannka/amphtml,Gregable/amphtml,jpettitt/amphtml,jridgewell/amphtml,alanorozco/amphtml,mhc-gh/amphtml,media-net/amphtml,sharethrough/amphtml,lannka/amphtml,Gregable/amphtml,adup-tech/amphtml,nexxtv/amphtml,alanorozco/amphtml,smartadserver/amphtml,adup-tech/amphtml,media-net/amphtml,jridgewell/amphtml,ampproject/amphtml,sharethrough/amphtml,rsimha-amp/amphtml,jmadler/amphtml,honeybadgerdontcare/amphtml,danielrozenberg/amphtml