[Backport 2.x] Adds default roles for Snapshot Management plugin (#1897)

[DarshitChanpura]

Signed-off-by: Clay Downs downsrob@amazon.com
(cherry picked from commit 7f5ca53)

Backport 7f5ca53 from #1897

Check List

- [ ] New functionality includes testing
- [ ] New functionality has been documented

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[codecov-commenter]

Codecov Report

Merging #1916 (b868a06) into 2.x (203ecb5) will increase coverage by 0.21%.
The diff coverage is 83.18%.

@@             Coverage Diff              @@
##                2.x    #1916      +/-   ##
============================================
+ Coverage     60.78%   61.00%   +0.21%     
- Complexity     3185     3233      +48     
============================================
  Files           253      256       +3     
  Lines         17931    18088     +157     
  Branches       3204     3224      +20     
============================================
+ Hits          10900    11034     +134     
- Misses         5454     5469      +15     
- Partials       1577     1585       +8     

Impacted Files	Coverage Δ
...ic/auth/http/jwt/AbstractHTTPJwtAuthenticator.java	55.81% <ø> (ø)
...t/keybyoidc/AuthenticatorUnavailableException.java	0.00% <ø> (ø)
...th/http/jwt/keybyoidc/BadCredentialsException.java	40.00% <ø> (ø)
...byoidc/HTTPJwtKeyByOpenIdConnectAuthenticator.java	94.11% <ø> (ø)
...azon/dlic/auth/http/jwt/keybyoidc/JwtVerifier.java	85.71% <ø> (ø)
.../dlic/auth/http/jwt/keybyoidc/KeySetRetriever.java	76.82% <ø> (ø)
.../auth/http/jwt/keybyoidc/SelfRefreshingKeySet.java	59.85% <ø> (ø)
...ttp/jwt/oidc/json/OpenIdProviderConfiguration.java	100.00% <ø> (ø)
...ic/auth/http/kerberos/HTTPSpnegoAuthenticator.java	0.00% <ø> (ø)
...azon/dlic/auth/http/kerberos/util/JaasKrbUtil.java	0.00% <ø> (ø)
... and 242 more

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