Update RHEL and FreeBSD versions used for tests:

- RHEL 7.4 -> 7.5
- FreeBSD 11.1 -> 11.2

(cherry picked from commit c50d6f1944)

shippable.yml

@@ -45,9 +45,9 @@ matrix:
     - env: T=network
 
     - env: T=osx/10.11/1
-    - env: T=rhel/7.4/1
+    - env: T=rhel/7.5/1
     - env: T=freebsd/10.4/1
-    - env: T=freebsd/11.1/1
+    - env: T=freebsd/11.2/1
     - env: T=linux/centos6/1
     - env: T=linux/centos7/1
     - env: T=linux/fedora24/1
@@ -58,9 +58,9 @@ matrix:
     - env: T=linux/ubuntu1604py3/1
 
     - env: T=osx/10.11/2
-    - env: T=rhel/7.4/2
+    - env: T=rhel/7.5/2
     - env: T=freebsd/10.4/2
-    - env: T=freebsd/11.1/2
+    - env: T=freebsd/11.2/2
     - env: T=linux/centos6/2
     - env: T=linux/centos7/2
     - env: T=linux/fedora24/2
@@ -71,9 +71,9 @@ matrix:
     - env: T=linux/ubuntu1604py3/2
 
     - env: T=osx/10.11/3
-    - env: T=rhel/7.4/3
+    - env: T=rhel/7.5/3
     - env: T=freebsd/10.4/3
-    - env: T=freebsd/11.1/3
+    - env: T=freebsd/11.2/3
     - env: T=linux/centos6/3
     - env: T=linux/centos7/3
     - env: T=linux/fedora24/3

test/runner/completion/remote.txt

@@ -1,4 +1,4 @@
 freebsd/10.4
-freebsd/11.1
+freebsd/11.2
 osx/10.11
-rhel/7.4
+rhel/7.5