Remove broken CI testing of 2.6-3.4

Author: jyemin

.evergreen/.evg.yml

@@ -346,9 +346,6 @@ functions:
 
 # Anchors
 
-hosts: &hosts
- - rhel70-small
-
 pre:
   - func: "fetch source"
   - func: "prepare resources"
@@ -460,28 +457,12 @@ axes:
         display_name: "3.6"
         variables:
            VERSION: "3.6"
-      - id: "3.4"
-        display_name: "3.4"
-        variables:
-           VERSION: "3.4"
-      - id: "3.2"
-        display_name: "3.2"
-        variables:
-           VERSION: "3.2"
-      - id: "3.0"
-        display_name: "3.0"
-        variables:
-           VERSION: "3.0"
-      - id: "2.6"
-        display_name: "2.6"
-        variables:
-           VERSION: "2.6"
   - id: os
     display_name: OS
     values:
       - id: "linux"
         display_name: "Linux"
-        run_on: *hosts
+        run_on: rhel70-small
       - id: "ubuntu"
         display_name: "Ubuntu 18.04"
         run_on: ubuntu1804-test
@@ -576,7 +557,7 @@ buildvariants:
 # Test packaging and other release related routines
 - name: static-checks
   display_name: "Static Checks"
-  run_on: *hosts
+  run_on: rhel70-small
   tasks:
     - name: "static-analysis"
 
@@ -588,7 +569,7 @@ buildvariants:
      - name: "test"
 
 - matrix_name: "tests-snappy-compression"
-  matrix_spec: { compressor : "snappy", auth: "noauth", ssl: "nossl", jdk: "jdk7", version: ["3.4", "3.6", "4.0", "4.2", "4.4", "5.0"], topology: "standalone", os: "linux" }
+  matrix_spec: { compressor : "snappy", auth: "noauth", ssl: "nossl", jdk: "jdk7", version: ["3.6", "4.0", "4.2", "4.4", "5.0"], topology: "standalone", os: "linux" }
   display_name: "${version} ${compressor} ${topology} ${auth} ${ssl} ${jdk} ${os} "
   tags: ["tests-variant"]
   tasks:
@@ -675,13 +656,13 @@ buildvariants:
 
 - name: plain-auth-test
   display_name: "PLAIN (LDAP) Auth test"
-  run_on: *hosts
+  run_on: rhel70-small
   tasks:
     - name: "plain-auth-test"
 
 - name: atlas-test
   display_name: "Atlas test"
-  run_on: *hosts
+  run_on: rhel70-small
   tasks:
     - name: "atlas-test"