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Reformatted shell scripts according to [ShellCheck](https://github.com/koalaman/shellcheck/).
I. Most common changes:
1. https://github.com/koalaman/shellcheck/wiki/SC2086
`$var` → `"$var"`
Note: this isn't always necessary and I've been careful not to substitute where it wasn't necessary in meaning.
2. https://github.com/koalaman/shellcheck/wiki/SC2006
`` `command` `` → `$(command)`
3. https://github.com/koalaman/shellcheck/wiki/SC2004
`$(( $a + $b ))` → `$(( a + b ))`
4. https://github.com/koalaman/shellcheck/wiki/SC2164
`cd "$dir"` → `cd "$dir" || exit 1`
5. https://github.com/koalaman/shellcheck/wiki/SC2166
`[ check1 -o check2 ]` → `[ check1 ] || [ check2 ]`
6. https://github.com/koalaman/shellcheck/wiki/SC2002
`cat "${file}" | wc -c` → `< "${file}" wc -c`
Note: this looks a bit uglier but works faster.
II. Some special changes:
1. In file `utils/common.sh`:
https://github.com/koalaman/shellcheck/wiki/SC2112
This script is interpreted by `sh`, not by `bash`, but uses the keyword `function`.
So I replaced `#!/usr/bin/env sh` to `#!/usr/bin/env bash`.
2. After that I thought of replacing all shebangs to `#!/usr/bin/env bash` for consistency and cross-platform compatibility, especially since most of the files already use bash.
3. But in cases when it was `#!/bin/sh -e` or `#!/bin/bash -eu` another problem appears:
https://github.com/koalaman/shellcheck/wiki/SC2096
So I decided to make all shebangs look uniform:
```
#!/usr/bin/env bash
set -e (or set -eu) (if needed)
```
4. In file `tests/ossfuzz.sh`:
https://github.com/koalaman/shellcheck/wiki/SC2162
`read i` → `read -r i`
Note: I think that there is no need in special treatment for backslashes, but I could be wrong.
5. In file `tests/do.sh.in`:
https://github.com/koalaman/shellcheck/wiki/SC2035
`ls *.*cap*` → `ls -- *.*cap*`
6. In file `utils/verify_dist_tarball.sh`:
https://github.com/koalaman/shellcheck/wiki/SC2268
`[ "x${TARBALL}" = x ]` → `[ -z "${TARBALL}" ]`
7. In file `utils/check_symbols.sh`:
https://github.com/koalaman/shellcheck/wiki/SC2221
`'[ndpi_utils.o]'|'[ndpi_memory.o]'|'[roaring.o]')` → `'[ndpi_utils.o]'|'[ndpi_memory.o]')`
8. In file `autogen.sh`:
https://github.com/koalaman/shellcheck/wiki/SC2145
`echo "./configure $@"` → `echo "./configure $*"`
https://github.com/koalaman/shellcheck/wiki/SC2068
`./configure $@` → `./configure "$@"`
III. `LIST6_MERGED` and `LIST_MERGED6`
There were typos with this variables in files `utils/aws_ip_addresses_download.sh`, `utils/aws_ip_addresses_download.sh` and `utils/microsoft_ip_addresses_download.sh` where variable `LIST6_MERGED` was defined, but `LIST_MERGED6` was removed by `rm`.
I changed all `LIST_MERGED6` to `LIST6_MERGED`.
Not all changes are absolutely necessary, but some may save you from future bugs.
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