Upgrade pyroute2 and improve cli response time (sonic-net#3513)

What I did
Older pyroute2 depends on distutils. Thus upgrade the version to latest to improve import time. A similar issue for natsort is reported here [warm-reboot] natsort import is taking more time with python 3.11 in bookworm sonic-buildimage#17246. However pyroute2 import is still heavy in bookworm and thus every CLI command is slow compared to bullseye.
<Bullseye>
root@msn2700:/home/admin# time python3 -c "import pyroute2"
real	0m0.378s
user	0m0.308s
sys	0m0.060s

<Before upgrade>
root@msn2700:/home/admin# time python3 -c "import pyroute2"
real        0m0.707s
user        0m0.425s
sys        0m0.097s

<After upgrade>
root@msn2700:/home/admin#  time python3 -c "import pyroute2"
real	0m0.511s
user	0m0.433s
sys	0m0.075s
To fix this, i've delayed the pyroute2 import into the method where it is actually used, this has an improvement of 0.4 sec for all the CLI commands on slower CPU devices
root@msn2700:/home/admin#  time python3 -c "import utilities_common.cli as clicommon"
real	0m0.693s
user	0m0.579s
sys	0m0.109s

root@msn2700/home/admin#  time python3 -c "import utilities_common.cli as clicommon"
real	0m0.363s
user	0m0.271s
sys	0m0.072s

Author: vivekrnv

setup.py

@@ -248,7 +248,7 @@
         'pexpect>=4.8.0',
         'semantic-version>=2.8.5',
         'prettyprinter>=0.18.0',
-        'pyroute2>=0.5.14, <0.6.1',
+        'pyroute2==0.7.12',
         'requests>=2.25.0, <=2.31.0',
         'tabulate==0.9.0',
         'toposort==1.6',

utilities_common/multi_asic.py

@@ -3,7 +3,6 @@
 
 import click
 import netifaces
-import pyroute2
 from natsort import natsorted
 from sonic_py_common import multi_asic, device_info
 from utilities_common import constants
@@ -170,6 +169,7 @@ def multi_asic_args(parser=None):
     return parser
 
 def multi_asic_get_ip_intf_from_ns(namespace):
+    import pyroute2
     if namespace != constants.DEFAULT_NAMESPACE:
         pyroute2.netns.pushns(namespace)
     interfaces = natsorted(netifaces.interfaces())
@@ -181,6 +181,7 @@ def multi_asic_get_ip_intf_from_ns(namespace):
 
 
 def multi_asic_get_ip_intf_addr_from_ns(namespace, iface):
+    import pyroute2
     if namespace != constants.DEFAULT_NAMESPACE:
         pyroute2.netns.pushns(namespace)
     ipaddresses = netifaces.ifaddresses(iface)