Add Thrift 0.14.1 compatibility

[msosyak]

Make saithrift compatible with thrift 0.14.1

How I did it:

• Replace union by struct in *.thrift files as saithrift code relays on an old thrift bug which was fixed in thrift 0.11.0. Due to that BUG unios behaves as struct. In SONiC there is patch to revert the fix in 0.11.0 .
• Use different shared_ptr based on thrift version. In Thrift 0.11.0 the boost::shared_ptr is usually used. But star from 0.13.0 the boost dependency was dropped in Thrift.
• Starting from 0.14.1 the constants files are not generated for CPP language, so added them conditionally.

Verified these changes in SONIC build env with different thrift version:

msosyak@b3c1a8d88f02:/sonic/src/sonic-sairedis/SAI$ dpkg -l | grep thrift
ii  libthrift-0.11.0                       0.11.0-4                                amd64        Thrift C++ library
ii  libthrift-dev                          0.11.0-4                                amd64        Thrift C++ library (development headers)
ii  python-thrift                          0.11.0-4                                amd64        Python library for Thrift
ii  thrift-compiler                        0.11.0-4                                amd64        code generator/compiler for Thrift definitions
msosyak@b3c1a8d88f02:/sonic/src/sonic-sairedis/SAI$ dpkg-buildpackage -rfakeroot -b -us -uc -tc -j6
dpkg-buildpackage: info: source package saithrift
dpkg-buildpackage: info: source version 0.9.4
dpkg-buildpackage: info: source distribution stable
dpkg-buildpackage: info: source changed by Pavel Shirshov <pavelsh@microsoft.com>
dpkg-buildpackage: info: host architecture amd64
 dpkg-source --before-build .
 fakeroot debian/rules clean
dh clean
dh: warning: Compatibility levels before 10 are deprecated (level 9 in use)
   debian/rules override_dh_auto_clean
make[1]: Entering directory '/sonic/src/sonic-sairedis/SAI'
dh_auto_clean
* * * 
 dpkg-source --after-build .
dpkg-buildpackage: info: binary-only upload (no source included)
msosyak@b3c1a8d88f02:/sonic/src/sonic-sairedis/SAI$ echo $?
0

msosyak@b3c1a8d88f02:/sonic/src/sonic-sairedis/SAI$ dpkg -l | grep thrift
ii  libthrift-0.11.0                       0.11.0-4                                amd64        Thrift C++ library
ii  libthrift-dev                          0.14.1                                  amd64        Thrift C++ library (development headers)
ii  libthrift0                             0.14.1                                  amd64        Thrift C++ library
ii  python-thrift                          0.14.1                                  amd64        Python bindings for Thrift (Python 2)
ii  thrift-compiler                        0.14.1                                  amd64        Compiler for Thrift definition files
(reverse-i-search)`d': ^Ckg -l | grep thrift
msosyak@b3c1a8d88f02:/sonic/src/sonic-sairedis/SAI$ dpkg-buildpackage -rfakeroot -b -us -uc -tc -j100 
dpkg-buildpackage: info: source package saithrift
dpkg-buildpackage: info: source version 0.9.4
dpkg-buildpackage: info: source distribution stable
dpkg-buildpackage: info: source changed by Pavel Shirshov <pavelsh@microsoft.com>
dpkg-buildpackage: info: host architecture amd64
 dpkg-source --before-build .
 fakeroot debian/rules clean
dh clean
* * * * *
 dpkg-source --after-build .
dpkg-buildpackage: info: binary-only upload (no source included)
msosyak@b3c1a8d88f02:/sonic/src/sonic-sairedis/SAI$ echo $?
0

[msosyak]

@richardyu-ms @kcudnik Please review

[msosyak]

@richardyu-ms Could we merge this?