Add validation for special IP 0.0.0.0 and 0.0.0.0/0.0.0.0 + test

[micw]

Description

IP validation sorts out any "reserved" IP. That's a good thing because we do not want e.g. to DHCP bind to broadcasts IPs. But there are some special cases that are filtered out by FILTER_FLAG_NO_RES_RANGE:

• Using 0.0.0.0 in "Ports and IPs" to create a Port listening on any IP
• Using 0.0.0.0/0.0.0.0 e.g. for MySQL to allow access to any IP

(Personally, I have only use case 1 but since It's quite similar, I added the other too).

Type of change

Please delete options that are not relevant.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [X] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

How Has This Been Tested?

I have manually tested that creating a port with IP 0.0.0.0 works as expected. I have added Tests into ValidationTests for both use cases.

Checklist:

• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation -> No idea where to document it exactly, it's just a minor fix/enhancement
• [?] My changes generate no new warnings -> How to test?
• [x] I have added tests that prove my fix is effective or that my feature works
• [X] New and existing unit tests pass locally with my changes

[micw]

Edit: Here's my travis error: https://travis-ci.org/micw/Froxlor/requests?requestId=190174624 But it should build now on travis automatically due to merge request

[codecov[bot]]

Codecov Report

Merging #760 into master will increase coverage by <.01%. The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #760      +/-   ##
============================================
+ Coverage     32.73%   32.74%   +<.01%     
- Complexity     5610     5613       +3     
============================================
  Files           107      107              
  Lines         15484    15486       +2     
============================================
+ Hits           5069     5071       +2     
  Misses        10415    10415

Impacted Files	Coverage Δ	Complexity Δ
lib/Froxlor/Validate/Validate.php	96.07% <100%> (+0.07%)	60 <0> (+3)	:arrow_up:

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 35ecdfa...044a6aa. Read the comment docs.

[d00p]

Allowing 0.0.0.0 as ip for domains will surely break DNS...