Add tests to vaildate the analysis server's integration test coverage.

pkg/analysis_server/test/integration/coverage.md

Index: pkg/analysis_server/test/integration/coverage.md
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+Checklist to ensure that we have integration test coverage of all analysis
+server calls.
+
+This file is validated by `coverage_test.dart`.
+
+## server domain
+- [x] server.getVersion
+- [x] server.shutdown
+- [x] server.setSubscriptions
+
+## analysis domain
+- [x] analysis.getErrors
+- [x] analysis.getHover
+- [ ] analysis.getReachableSources
+- [ ] analysis.getLibraryDependencies
+- [ ] analysis.getNavigation
+- [x] analysis.reanalyze
+- [ ] analysis.setAnalysisRoots
+- [ ] analysis.setGeneralSubscriptions
+- [ ] analysis.setPriorityFiles
+- [ ] analysis.setSubscriptions
+- [x] analysis.updateContent
+- [ ] analysis.updateOptions
+
+## completion domain
+- [x] completion.getSuggestions
+
+## search domain
+- [ ] search.findElementReferences
+- [ ] search.findMemberDeclarations
+- [ ] search.findMemberReferences
+- [ ] search.findTopLevelDeclarations
+- [x] search.getTypeHierarchy
+
+## edit domain
+- [ ] edit.format
+- [ ] edit.getAssists
+- [ ] edit.getAvailableRefactorings
+- [ ] edit.getFixes
+- [ ] edit.getRefactoring
+- [ ] edit.sortMembers
+- [ ] edit.organizeDirectives
+
+## execution domain
+- [ ] execution.createContext
+- [ ] execution.deleteContext
+- [x] execution.mapUri
+- [ ] execution.setSubscriptions
+
+## diagnostic domain
+- [ ] diagnostic.getDiagnostics