Switch to GitHub's new issue templates.

Signed-off-by: Eric Hotinger <ehotinger@gmail.com>

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a bug report to help improve containerd
+title: ''
+labels: kind/bug
+assignees: ''
+---
+
+<!--
+If you are reporting a new issue, make sure that we do not have any duplicates
+already open. You can ensure this by searching the issue list for this
+repository. If there is a duplicate, please close your issue and add a comment
+to the existing issue instead.
+-->
+
+**Description**
+
+<!--
+Briefly describe the problem you are having in a few paragraphs.
+-->
+
+**Steps to reproduce the issue:**
+1.
+2.
+3.
+
+**Describe the results you received:**
+
+
+**Describe the results you expected:**
+
+
+**Output of `containerd --version`:**
+
+```
+(paste your output here)
+```
+
+**Any other relevant information:**

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for containerd
+title: ''
+labels: kind/feature
+assignees: ''
+---
+
+**What is the problem you're trying to solve**
+A clear and concise description of what the problem is.
+
+**Describe the solution you'd like**
+A clear and concise description of what you'd like to happen.
+
+**Additional context**
+Add any other context about the feature request here.