Namespace support

[majst01]

Allows creation of overlapping prefixes which reside in different namespaces, in the same namespace prefixes must still not overlap.

fixes #25

TODO:

• [ ] migration of existing data only works for postgres, cockroach is not working because PRIMARY KEY naming is different.
• [ ] Only set "@namespace" prefix if namespace is set for memory and redis, probably introduce a prefixer interface
• [ ] Consider using a separate table for sql storage or database in redis or other map for memory.

[codecov-io]

Codecov Report

Merging #43 (07e6c15) into master (7ae0c89) will decrease coverage by 1.28%. The diff coverage is 69.76%.

@@            Coverage Diff             @@
##           master      #43      +/-   ##
==========================================
- Coverage   77.35%   76.06%   -1.29%     
==========================================
  Files           5        5              
  Lines         468      493      +25     
==========================================
+ Hits          362      375      +13     
- Misses         56       68      +12     
  Partials       50       50              

Impacted Files	Coverage Δ
ipam.go	75.00% <0.00%> (-25.00%)	:arrow_down:
postgres.go	70.00% <ø> (ø)
sql.go	63.80% <64.70%> (-2.17%)	:arrow_down:
memory.go	84.61% <68.42%> (-10.39%)	:arrow_down:
prefix.go	78.88% <100.00%> (+0.26%)	:arrow_up:

---

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[codecov-commenter]

Codecov Report

Merging #43 (a9af5d2) into master (59c4948) will decrease coverage by 3.07%. The diff coverage is 64.13%.

@@            Coverage Diff             @@
##           master      #43      +/-   ##
==========================================
- Coverage   78.50%   75.42%   -3.08%     
==========================================
  Files           7        7              
  Lines         642      700      +58     
==========================================
+ Hits          504      528      +24     
- Misses         74      107      +33     
- Partials       64       65       +1     

Impacted Files	Coverage Δ
ipam.go	71.42% <0.00%> (-28.58%)	:arrow_down:
postgres.go	71.42% <ø> (ø)
redis.go	64.28% <56.75%> (-8.13%)	:arrow_down:
sql.go	57.95% <61.11%> (-3.30%)	:arrow_down:
memory.go	82.85% <69.23%> (-13.37%)	:arrow_down:
json.go	88.57% <100.00%> (+0.69%)	:arrow_up:
prefix.go	80.48% <100.00%> (+0.21%)	:arrow_up:

---

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Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 59c4948...a9af5d2. Read the comment docs.