Upgrade pyroute2 and improve cli response time

setup.py

@@ -249,7 +249,7 @@
         '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)