HPCC-8528 Creat/remove symbolic links with ClientTools installend/Uninstall

The fix includes followings:
1) A new directory clienttools under the top of source tree. It seperates install
   related scripts from Platform.
2) A new script: /opt/HPCCSystems/<version>/clienttools/etc/init.d/install/post_install.sh
   It will create the symbolic links of binaries (the list is hard-coded in the script) under
   clienttools/bin in /usr/bin.
   Run it with "-u" will remove the links if they belong to current version of clienttools
   The script should be run as user root.
3) If HPCC-Platform does not exist new clienttools install will create the symbolic
   links with script post_install.sh
4) When uninstall a clienttools symbolic links will be removed with "post_install.sh -u"
   It only remove the link if it points to the file under current clienttools/bin/.
5) After clienttools uninstall, if there are still other clienttools left and not HPCC-Platform
   installed, it is user's responsibility to manually pick a clienttools and run post_install.sh
   if it exists.
6) Above fixes will be applied to rpm and deb package (Linux). There should be no change and impact
   on Mac and Windows.
7) There will be another JIRA ticket to address the similar issue on Mac OS X.
HPCC-8528 change permission
HPCC-8528 Add #!/bin/bash in install scripts

Add #!/bin/bash in pre/post install/uninstall scripts.
Most Linux will tolerate if this is missing. But some old distro
for example, Ubuntu 10.04 will fail and throw an error during install/uninstall
HPCC-8528 Modify the code after pull request comments

Modify symbolic link list: add ecl-bundle and remove satrt-stop-daemon
Modify clienttools/install/CMakeLists.txt
Merge pull request #4921 from xwang2713/Ming_HPCC_8528

HPCC-8528 Create/remove symbolic links with during install/uninstall of clienttools

Reviewed-By: Gordon Smith <gordon.smith@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>