[minor_change] Added uSeg Attribute resource and data-source files

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 88.18205% with 457 lines in your changes missing coverage. Please review.

Project coverage is 87.34%. Comparing base (2d8ffe2) to head (83fe6ac).

Files	Patch %	Lines
.../provider/resource_aci_epg_useg_block_statement.go	86.87%	37 Missing and 21 partials :warning:
...al/provider/resource_aci_epg_useg_dns_attribute.go	86.09%	37 Missing and 21 partials :warning:
...nal/provider/resource_aci_epg_useg_ip_attribute.go	86.54%	37 Missing and 21 partials :warning:
...al/provider/resource_aci_epg_useg_mac_attribute.go	86.05%	37 Missing and 21 partials :warning:
...vider/resource_aci_epg_useg_sub_block_statement.go	86.19%	37 Missing and 21 partials :warning:
...nal/provider/resource_aci_epg_useg_vm_attribute.go	87.65%	37 Missing and 21 partials :warning:
...ovider/resource_aci_epg_useg_ad_group_attribute.go	87.29%	35 Missing and 18 partials :warning:
...der/data_source_aci_epg_useg_ad_group_attribute.go	92.85%	6 Missing and 2 partials :warning:
...ovider/data_source_aci_epg_useg_block_statement.go	93.33%	6 Missing and 2 partials :warning:
...provider/data_source_aci_epg_useg_dns_attribute.go	92.85%	6 Missing and 2 partials :warning:
... and 4 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1239 +/- ## ========================================== + Coverage 87.09% 87.34% +0.24% ========================================== Files 45 59 +14 Lines 11802 15641 +3839 ========================================== + Hits 10279 13661 +3382 - Misses 1035 1334 +299 - Partials 488 646 +158 ```

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