Refactor AWS-CLI aliases.

- Add region alias for configured (profile) region.
- Add metadata-region for outputting the region from the EC2 metadata
service, moved from .bashrc (no longer exported as AWS_DEFAULT_REGION,
not an issue since it could only be used in EC2 instances and not for
local use, it was there mainly as a reminder for me).
- Add ecr-login instead of a shell alias, works the same.

.aws/cli/alias

 [toplevel]
 
 whoami = sts get-caller-identity
+region = configure get region
+ecr-login = !$(aws ecr get-login --no-include-email)
+metadata-region = !python3 << EOF
+    from urllib.request import urlopen
+    import json
+    response = urlopen('http://169.254.169.254/latest/dynamic/instance-identity/document')
+    print(json.loads(response.read().decode('utf-8'))['region'])
+    EOF

.bashrc

@@ -67,7 +67,6 @@ alias ansible-local='ansible localhost -c local -i localhost,'
 alias ansible-local-playbook='ansible-playbook -i localhost, -c local'
 alias concat="perl -pe 's/\\n/\\\\n/g'"
 alias deconcat="perl -pe 's/\\\\n/\\n/g'"
-alias ecr-login='eval $(aws ecr get-login --no-include-email)'
 alias hostlocal='docker run --rm --privileged --net=host gliderlabs/hostlocal'
 alias cadvisor='docker run --rm   --volume=/:/rootfs:ro --volume=/var/run:/var/run:rw --volume=/sys:/sys:ro --volume=/var/lib/docker/:/var/lib/docker:ro --volume=/dev/disk/:/dev/disk:ro --publish=8080:8080 --detach=true --name=cadvisor google/cadvisor:latest'
 alias apt-daily="monitor __apt-daily"
@@ -173,18 +172,6 @@ cyan () {
     printf '\e[0m' || true
 }
 
-deduce_aws_region () {
-    AWS_DEFAULT_REGION="$(python3 << EOF
-from urllib.request import urlopen
-import json
-response = urlopen('http://169.254.169.254/latest/dynamic/instance-identity/document')
-print(json.loads(response.read().decode('utf-8'))['region'])
-EOF
-    )"
-    export AWS_DEFAULT_REGION
-    echo "$AWS_DEFAULT_REGION"
-}
-
 ssh_keyscan_add () {
     ssh-keyscan "$@" >> "$HOME/.ssh/known_hosts"
     sort -uo "$HOME/.ssh/known_hosts" "$HOME/.ssh/known_hosts"