Remove jira issue type

Replaces --issue-type with a string flag. This allows for more
flexibility as each project may have different set of types. Validation
is performed on execution of the brew command.

Updated help text as well with examples and a default of Bug

cmd/brew.go

@@ -49,7 +49,7 @@ const docImpactKey = "Doc Impact"
 
 var description string
 var docImpact bool
-var issueType jiraIssueType
+var issueType string
 var components []string
 var labels []string
 var projectKey string
@@ -60,7 +60,7 @@ func init() {
 	RootCmd.AddCommand(brewCmd)
 
 	brewCmd.Flags().StringVarP(&projectKey, "project", "p", "", "JIRA project key, e.g. SDC, SDCE")
-	brewCmd.Flags().VarP(&issueType, "issue-type", "t", "Issue type to create")
+	brewCmd.Flags().StringVarP(&issueType, "issue-type", "t", "Bug", "Issue type to create, e.g. Bug, 'New Feature', etc. This varies by project.")
 	brewCmd.Flags().StringVarP(&summary, "summary", "s", "", "Issue summary")
 	brewCmd.Flags().StringVarP(&description, "description", "d", "", "Issue detailed description. If not specified defaults to summary")
 	brewCmd.Flags().BoolVarP(&docImpact, "doc-impact", "x", false, "When included, sets the Doc Impact field to 'Yes'")
@@ -153,7 +153,7 @@ func brew(cmd *cobra.Command, args []string) {
 			return
 		}
 
-		metaIssueType, err := createMetaIssueType(metaProject, string(issueType))
+		metaIssueType, err := createMetaIssueType(metaProject, issueType)
 		if err != nil {
 			log.WithField("error", err).Fatal()
 			return