debian: align install files to Debian/Ubuntu official (2)

- For Ubuntu/Debian, the package lib dir (PKD_LIB_DIR), is set to
  /usr/libexec/uhd. This is the path where examples, tests and
  utils get installed.
- List usrp_hwd.py explicitly as not installed.

Author: joergho

host/cmake/debian/not-installed

@@ -0,0 +1 @@
+usr/bin/usrp_hwd.py

host/cmake/debian/rules

@@ -10,7 +10,7 @@ DEB_UHD_PACKAGE_CONFIGURATION=$(shell echo "-DCMAKE_BUILD_TYPE=RelWithDebInfo -D
 					-DENABLE_PYTHON_API=ON \
 					-DENABLE_RFNOC_DEV=ON \
 					-DPYTHON_EXECUTABLE:FILEPATH=/usr/bin/python3 \
-					-DPKG_LIB_DIR="/usr/lib/uhd" \
+					-DPKG_LIB_DIR="/usr/libexec/uhd" \
 					-DDOXYGEN_HAVE_DOT=True \
 					-DUHD_PYTHON_DIR="lib/python3/dist-packages" \
 					-DUSRP_MPM_PYTHON_DIR="lib/python3/dist-packages" \
@@ -40,9 +40,9 @@ override_dh_auto_install-arch:
 	cp debian/uhd-host.limits debian/uhd-host/etc/security/limits.d/uhd.conf
 	cp debian/uhd-host.sysctl debian/uhd-host/etc/sysctl.d/uhd-usrp2.conf
 	dh_auto_install
-	chmod -x debian/tmp/usr/lib/uhd/tests/devtest/*.py
-	chmod -x debian/tmp/usr/lib/uhd/tests/streaming_performance/parse_benchmark_rate.py
-	chmod -x debian/tmp/usr/lib/uhd/tests/streaming_performance/run_benchmark_rate.py
+	chmod -x debian/tmp/usr/libexec/uhd/tests/devtest/*.py
+	chmod -x debian/tmp/usr/libexec/uhd/tests/streaming_performance/parse_benchmark_rate.py
+	chmod -x debian/tmp/usr/libexec/uhd/tests/streaming_performance/run_benchmark_rate.py
 	rm -rf debian/tmp/usr/share/man
 	rm -rf debian/tmp/usr/share/doc/uhd/LICENSE
 	rm -rf debian/tmp/usr/share/doc/uhd/README.md

host/cmake/debian/uhd-host.dirs

@@ -2,6 +2,6 @@ etc/security/limits.d
 etc/sysctl.d
 usr/bin
 usr/lib
-usr/lib/uhd/examples
-usr/lib/uhd/tests
-usr/lib/uhd/utils
+usr/libexec/uhd/examples
+usr/libexec/uhd/tests
+usr/libexec/uhd/utils

host/cmake/debian/uhd-host.install

@@ -1,4 +1,5 @@
 debian/NetworkManager-USRP /etc/NetworkManager/system-connections/
+usr/libexec/uhd* /usr/libexec/
 usr/bin/rfnoc_image_builder
 usr/bin/rfnoc_modtool
 usr/bin/uhd_adc_self_cal