Bug 1641830

Description of problem:

`update-crypto-policies --set <policy>` should create the files and symbolic links in /etc/crypto-policies/back-ends.
If there is a file of the form $app-XXX.config in /etc/crypto-policies/local.d
it's supposed to be appended to the policy file of $app.

Currently, this does not work, local custom files get ignored.


Version-Release number of selected component (if applicable):
crypto-policies-20180925-1.git71ca85f.fc29


How reproducible:

Steps to Reproduce:
1. place a custom file in /etc/crypto-policies/local.d, e.g. 
  /etc/crypto-policies/local.d/gnutls-test.config, fill it with some
  string, e.g. 
  "OPENCONNECT=NONE:+DHE-RSA:+AES-256-CBC:+SHA256:+VERS-TLS1.2:+SIGN-RSA-SHA256"
2. run `update-crypto-policies --set DEFAULT`
3. /etc/crypto-policies/back-ends/gnutls.config should now contain the content
  of /usr/share/crypto-policies/DEFAULT/gnutls.txt and appended 
  "OPENCONNECT=NONE:+DHE-RSA:+AES-256-CBC:+SHA256:+VERS-TLS1.2:+SIGN-RSA-SHA256"
  but it's just a link to /usr/share/crypto-policies/DEFAULT/gnutls.txt


Actual results:
The custom configuration files don't get included.


Expected results:
The custom configuration files should get included.


Additional info:
I believe the culprit is in /usr/bin/update-crypto-policies in line 90:
```
	if test -z $(ls "$local_dir/$basefile-*.config" 2>/dev/null);then
```
Here, the glob symbol * gets used within quotation marks and this does not expand. Therefore the local customization file isn't found and the code branch
for appending it does not get executed.
I think the quotation marks are intended to catch the case that someone uses 
custom configuration files with white spaces in the file name.
In this case I propose
```
	if test -z "$(ls $local_dir/$basefile-*.config 2>/dev/null)";then
```
This way `test -z` gets a quoted string that can contain white spaces and the
glob within also works. But please take a critical look at it yourself, I might
have misunderstood what was intended with the quotes.