Dev/CI: Remove Go 1.10.1, default to 1.10.2 (letsencrypt#3711)

Production/staging have been updated to a release built with Go 1.10.2.
This allows us to remove the Go 1.10.1 builds from the travis matrix and
default to Go 1.10.2.

.travis.yml

@@ -1,7 +1,6 @@
 language: go
 
 go:
-  - "1.10.1"
   - "1.10.2"
 
 go_import_path: github.com/letsencrypt/boulder

docker-compose.yml

@@ -2,7 +2,7 @@ version: '3'
 services:
     boulder:
         # To minimize fetching this should be the same version used below
-        image: letsencrypt/boulder-tools-go${TRAVIS_GO_VERSION:-1.10.1}:2018-05-04
+        image: letsencrypt/boulder-tools-go${TRAVIS_GO_VERSION:-1.10.2}:2018-05-04
         environment:
             FAKE_DNS: 127.0.0.1
             PKCS11_PROXY_SOCKET: tcp://boulder-hsm:5657
@@ -44,7 +44,7 @@ services:
         working_dir: /go/src/github.com/letsencrypt/boulder
     bhsm:
         # To minimize fetching this should be the same version used above
-        image: letsencrypt/boulder-tools-go${TRAVIS_GO_VERSION:-1.10.1}:2018-05-04
+        image: letsencrypt/boulder-tools-go${TRAVIS_GO_VERSION:-1.10.2}:2018-05-04
         environment:
             PKCS11_DAEMON_SOCKET: tcp://0.0.0.0:5657
         command: /usr/local/bin/pkcs11-daemon /usr/lib/softhsm/libsofthsm2.so

test/boulder-tools/tag_and_upload.sh

@@ -4,7 +4,7 @@ cd $(dirname $0)
 
 DATESTAMP=$(date +%Y-%m-%d)
 BASE_TAG_NAME="letsencrypt/boulder-tools"
-GO_VERSIONS=( "1.10.1" "1.10.2" )
+GO_VERSIONS=( "1.10.2" )
 
 # Build a tagged image for each GO_VERSION
 for GO_VERSION in "${GO_VERSIONS[@]}"