[Jenkins] Fix the specific kernel headers version within an Ubuntu release

Jenkinsfiles/Linux

@@ -15,7 +15,7 @@ pipeline {
                             make -j 8 WERROR=1
                             make -j 8 WERROR=1 test
                             cd Pal/ipc/linux
-                            make
+                            make KERNELDIR=/lib/modules/4.4.0-161-generic/build
                            '''
                     }
                 }

Jenkinsfiles/Linux-18.04

@@ -9,8 +9,8 @@ pipeline {
                             make -j 8 WERROR=1
                             make -j 8 WERROR=1 test
                             # We can't build this on 18.04 in our current pipeline
-                            #cd Pal/ipc/linux
-                            #make
+                            cd Pal/ipc/linux
+                            make KERNELDIR=/lib/modules/4.15.0-20-generic/build
                            '''
                     }
                 }

Jenkinsfiles/ubuntu-16.04.dockerfile

@@ -15,8 +15,7 @@ RUN apt-get update \
        libexpat1-dev \
        libpcre3-dev \
        libxml2-dev \
-       linux-headers-generic \
-       linux-headers-$(uname -r) \
+       linux-headers-4.4.0-161-generic \
        net-tools \
        python \
        python-protobuf \

Jenkinsfiles/ubuntu-18.04.dockerfile

@@ -10,12 +10,13 @@ RUN apt-get update && apt-get install -y \
     bison \
     gettext \
     git \
+    libelf-dev \
     libexpat1 \
     libexpat1-dev \
     libomp-dev \
     libpcre3-dev \
     libxml2-dev \
-    linux-headers-generic \
+    linux-headers-4.15.0-20-generic \
     net-tools \
     python \
     python-protobuf \