Prepare for Release 1.2.7 (#5976)

Prepare for Release 1.2.7 with version update with changelog.

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### General Guidelines and Best Practices
- [x] I have read the [contribution guidelines](https://github.com/azure/iotedge#contributing).
- [x] Title of the pull request is clear and informative.
- [x] Description of the pull request includes a concise summary of the enhancement or bug fix.

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- [ ] Pull request includes test coverage for the included changes.
- Description of the pull request includes 
	- [ ] concise summary of tests added/modified
	- [ ] local testing done.  

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CHANGELOG.md

@@ -1,7 +1,30 @@
+# 1.2.7 (2021-01-19)
+## Edge Agent
+### Bug Fixes
+* Update base image for security patch ( [8194a93](https://github.com/Azure/iotedge/commit/8194a93ab147658ca545dd8da97c0088904f284d) )
+
+
+## Edge Hub
+### Bug Fixes
+* Update base image for security patch ( [8194a93](https://github.com/Azure/iotedge/commit/8194a93ab147658ca545dd8da97c0088904f284d) )
+* Update vulnerable nix version ( [ca6958f](https://github.com/Azure/iotedge/commit/ca6958f7a3995c43973e4fbd006c1be737b60fe8) )
+
+
+## aziot-edge
+### Bug Fixes
+* Removed Moby check ( [27a14d8](https://github.com/Azure/iotedge/commit/27a14d817d8de78b562691945689fa4400de56b6) )
+* Fix for workload socket issue for concurrent module creation ( [5712dcc](https://github.com/Azure/iotedge/commit/5712dcc28498121d890082d5c884d9855cc40efd) )
+* Addition of device ID to edge CA common name to support large number of devices ( [6627c7a](https://github.com/Azure/iotedge/commit/6627c7a835ed6b252da00faa29b9d9b8e5cd501b) )
+
+
+### Features
+* New IoTedge check called proxy-settings which verifies proxy settings ( [4983128](https://github.com/Azure/iotedge/commit/49831285a02de9189ac338237aaa0f529a72c559) )
+
+
 # 1.2.6 (2021-11-12)
 ## Edge Agent
 ### Bug Fixes
-* Revert [2677657](https://github.com/Azure/iotedge/commit/26776577a4eec9414108e29d2bb4263c9b2d8b76), which inadvertently disabled duration and Unix timestamp formats in the since and until arguments of GetModuleLogs and UploadModuleLogs direct methods ([f7f4b89](https://github.com/Azure/iotedge/commit/f7f4b89e697808365f81b7ada622bdb4bf87e722))
+* Revert [2677657](https://github.com/Azure/iotedge/commit/26776577a4eec9414108e29d2bb4263c9b2d8b76), which inadvertently disabled duration and Unix timestamp formats in the since and until arguments of GetModuleLogs and UploadModuleLogs direct methods ( [f7f4b89](https://github.com/Azure/iotedge/commit/f7f4b89e697808365f81b7ada622bdb4bf87e722) )
 
 # 1.2.5 (2021-11-09)
 ## Edge Agent

edgelet/contrib/centos/aziot-edge.spec

@@ -17,7 +17,7 @@ URL:            https://github.com/azure/iotedge
 %{?systemd_requires}
 BuildRequires:  systemd
 Requires(pre):  shadow-utils
-Requires:       aziot-identity-service = 1.2.4-1
+Requires:       aziot-identity-service = 1.2.5-1
 Source0:        aziot-edge-%{version}.tar.gz
 
 %description

edgelet/contrib/debian/control

@@ -8,7 +8,7 @@ Homepage: https://github.com/azure/iotedge
 
 Package: aziot-edge
 Architecture: any
-Depends: ${misc:Depends}, ${shlibs:Depends}, adduser, ca-certificates, hostname, aziot-identity-service (= 1.2.4-1), sed
+Depends: ${misc:Depends}, ${shlibs:Depends}, adduser, ca-certificates, hostname, aziot-identity-service (= 1.2.5-1), sed
 Description: Azure IoT Edge Module Runtime
  Azure IoT Edge is a fully managed service that delivers cloud intelligence
  locally by deploying and running artificial intelligence (AI), Azure services,

edgelet/version.txt

@@ -1 +1 @@
-1.2.5
+1.2.7

versionInfo.json

@@ -1,5 +1,5 @@
 {
-  "version": "1.2.6",
+  "version": "1.2.7",
   "build": "BUILDNUMBER",
   "commit": "COMMITID"
 }