Sven Fischer 4460fb7004 docker-entrypoint.sh: fix shellcheck issues
issues found by shellcheck were:

```
$ shellcheck docker-entrypoint.sh

In docker-entrypoint.sh line 10:
    if [[ ${USERMAP_UID} != ${USERMAP_ORIG_UID} || ${USERMAP_GID} != ${USERMAP_ORIG_GID} ]]; then
                            ^-- SC2053: Quote the rhs of != in [[ ]] to prevent glob matching.
                                                                     ^-- SC2053: Quote the rhs of != in [[ ]] to prevent glob matching.

In docker-entrypoint.sh line 12:
        groupmod -g ${USERMAP_GID} paperless
                    ^-- SC2086: Double quote to prevent globbing and word splitting.

In docker-entrypoint.sh line 65:
        if dpkg -s "$pkg" 2>&1 > /dev/null; then
                          ^-- SC2069: The order of the 2>&1 and the redirect matters. The 2>&1 has to be last.

In docker-entrypoint.sh line 69:
        if ! apt-cache show "$pkg" 2>&1 > /dev/null; then
                                   ^-- SC2069: The order of the 2>&1 and the redirect matters. The 2>&1 has to be last.
```
2017-06-12 21:09:59 +02:00
..
2016-09-21 00:04:41 +05:30