Use /bin/sh instead of /bin/bash if possible in scripts

[emanuelb]

There are many scripts in repo that use #!/bin/bash for some of them it's possible to use #!/bin/sh instead without other modifications, for example like in ./eznode/tor/install ./eznode/tor/bin/tor-newnym

it might worth to change it for some other scripts as well if they not relaying to much on bash specific operations (see checkbashisms tool)