/etc/scion/hosts and /etc/resolv.conf

[tzaeschke]

Add support for /etc/scion/hosts and /etc/resolv.conf

---

This change is 

[codecov]

Codecov Report

Attention: Patch coverage is 81.50685% with 27 lines in your changes are missing coverage. Please review.

Project coverage is 77.49%. Comparing base (c6a0560) to head (c550289).

❗ Current head c550289 differs from pull request most recent head 7e2c1de. Consider uploading reports for the commit 7e2c1de to get more accurate results

Files	Patch %	Lines
src/main/java/org/scion/ScionService.java	60.00%	9 Missing and 5 partials ⚠️
src/main/java/org/scion/internal/DNSHelper.java	82.97%	5 Missing and 3 partials ⚠️
.../main/java/org/scion/internal/HostsFileParser.java	91.22%	3 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #40      +/-   ##
============================================
+ Coverage     75.86%   77.49%   +1.62%     
- Complexity      367      402      +35     
============================================
  Files            26       26              
  Lines          1848     1946      +98     
  Branches        244      260      +16     
============================================
+ Hits           1402     1508     +106     
+ Misses          334      327       -7     
+ Partials        112      111       -1     

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