Encourage using KeePassX for network firewall admin password
Encourage using KeePassX for network firewall admin password

Based on review comment from @dolanjs:
https://github.com/freedomofpress/securedrop/pull/830#discussion_r23106111

harlo/securedrop,heartsucker/securedrop,ehartsuyker/securedrop,heartsucker/securedrop,pwplus/securedrop,ehartsuyker/securedrop,micahflee/securedrop,jaseg/securedrop,jeann2013/securedrop,GabeIsman/securedrop,chadmiller/securedrop,micahflee/securedrop,pwplus/securedrop,jaseg/securedrop,jrosco/securedrop,heartsucker/securedrop,harlo/securedrop,ehartsuyker/securedrop,GabeIsman/securedrop,ageis/securedrop,pwplus/securedrop,kelcecil/securedrop,chadmiller/securedrop,garrettr/securedrop,jaseg/securedrop,ageis/securedrop,pwplus/securedrop,micahflee/securedrop,garrettr/securedrop,chadmiller/securedrop,jrosco/securedrop,jeann2013/securedrop,jeann2013/securedrop,conorsch/securedrop,GabeIsman/securedrop,conorsch/securedrop,jeann2013/securedrop,GabeIsman/securedrop,harlo/securedrop,garrettr/securedrop,jaseg/securedrop,ageis/securedrop,jrosco/securedrop,ehartsuyker/securedrop,chadmiller/securedrop,pwplus/securedrop,kelcecil/securedrop,garrettr/securedrop,pwplus/securedrop,jrosco/securedrop,ehartsuyker/securedrop,heartsucker/securedrop,jeann2013/securedrop,jaseg/securedrop,heartsucker/securedrop,ageis/securedrop,jeann2013/securedrop,jrosco/securedrop,harlo/securedrop,kelcecil/securedrop,GabeIsman/securedrop,jaseg/securedrop,jrosco/securedrop,chadmiller/securedrop,micahflee/securedrop,chadmiller/securedrop,ehartsuyker/securedrop,kelcecil/securedrop,harlo/securedrop,GabeIsman/securedrop,conorsch/securedrop,kelcecil/securedrop,conorsch/securedrop,kelcecil/securedrop,harlo/securedrop,conorsch/securedrop