ci: speed up code-coverage jobs

refs #3809

Change-Id: If8c5284d5e21d5a30e543ea070fde3d1f199d771
diff --git a/.jenkins.d/20-ndns.sh b/.jenkins.d/20-ndns.sh
index b47b93b..db41533 100755
--- a/.jenkins.d/20-ndns.sh
+++ b/.jenkins.d/20-ndns.sh
@@ -13,7 +13,7 @@
 # Cleanup
 sudo ./waf -j1 --color=yes distclean
 
-if [[ "$JOB_NAME" != *"limited-build" ]]; then
+if [[ $JOB_NAME != *"code-coverage" && $JOB_NAME != *"limited-build" ]]; then
   # Configure/build in optimized mode with tests
   ./waf -j1 --color=yes configure --with-tests
   ./waf -j1 --color=yes build
@@ -30,7 +30,7 @@
 fi
 
 # Configure/build in debug mode with tests
-if [[ "$JOB_NAME" == *"code-coverage" ]]; then
+if [[ $JOB_NAME == *"code-coverage" ]]; then
     COVERAGE="--with-coverage"
 elif ! has OSX-10.9 $NODE_LABELS && ! has OSX-10.11 $NODE_LABELS; then
     ASAN="--with-sanitizer=address"
diff --git a/.jenkins.d/README.md b/.jenkins.d/README.md
index 956ae18..b1bd93a 100644
--- a/.jenkins.d/README.md
+++ b/.jenkins.d/README.md
@@ -9,17 +9,17 @@
 
   The list should include at least `[OS_TYPE]`, `[DISTRO_TYPE]`, and `[DISTRO_VERSION]`.
 
-  Possible values for Linux OS:
+  Possible values for Linux:
 
   * `[OS_TYPE]`: `Linux`
   * `[DISTRO_TYPE]`: `Ubuntu`
-  * `[DISTRO_VERSION]`: `Ubuntu-12.04`, `Ubuntu-14.04`, `Ubuntu-15.04`
+  * `[DISTRO_VERSION]`: `Ubuntu-14.04`, `Ubuntu-16.04`
 
-  Possible values of OSX OS:
+  Possible values for OS X / macOS:
 
   * `[OS_TYPE]`: `OSX`
   * `[DISTRO_TYPE]`: `OSX` (can be absent)
-  * `[DISTRO_VERSION]`: `OSX-10.10`, `OSX-10.9`, `OSX-10.8`, `OSX-10.7`
+  * `[DISTRO_VERSION]`: `OSX-10.10`, `OSX-10.11`, `OSX-10.12`
 
 - `JOB_NAME`: optional variable to define type of the job.  Depending on the defined job type,
   the build scripts can perform different tasks.
@@ -27,4 +27,5 @@
   Possible values:
 
   * empty: default build process
-  * `code-coverage` (Linux OS is assumed): build process with code coverage analysis
+  * `code-coverage` (Linux OS is assumed): debug build with tests and code coverage analysis
+  * `limited-build`: only a single debug build with tests
diff --git a/.travis.yml b/.travis.yml
index 1066eb7..49058cc 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,8 @@
 sudo: required
 language: generic
+env:
+  global:
+    - JOB_NAME=limited-build
 matrix:
   include:
     - os: linux