This is not reproducible with debug build, all tests pass with it.

At first L2 Endpoint learning was failing, but a few patches (and one new test) later there's a L3 ep failure. Looks like an endpoint is not configured after its config has been deleted:
05:27:52,081 CLI: show gbp endpoint
05:27:52,082 Endpoints:
[@0] ips:[10.0.0.127/32, 2001:10::1/128, ] mac:02:01:00:00:ff:02 last-time:[52]
control-plane
pg0 EPG:0
fwd:
itf:[pg0 locks:1 input-feats: none configured output-feats: none configured]

05:27:52,082 API: gbp_endpoint_dump ({})

Console:
==============================================================================
GBP Test Case
==============================================================================
Group Based Policy OK
GBP L2 Endpoint Learning OK
GBP L3 Endpoint Learning FAIL [ temp dir used by test case: /tmp/vpp-unittest-TestGBP-CvZ439 ]
GBP L2 Endpoint w/ VLANs ERROR [ temp dir used by test case: /tmp/vpp-unittest-TestGBP-CvZ439 ]
GBP Endpoint Redirect OK

==============================================================================
ERROR: GBP L2 Endpoint w/ VLANs
------------------------------------------------------------------------------
Traceback (most recent call last):
File "/home/jlinkes/vpp/test/test_gbp.py", line 1822, in test_gbp_learn_vlan_l2
self.pg2.config_ip4()
File "/home/jlinkes/vpp/test/vpp_interface.py", line 252, in config_ip4
self.sw_if_index, self.local_ip4n, self.local_ip4_prefix_len)
File "/home/jlinkes/vpp/test/vpp_papi_provider.py", line 284, in sw_interface_add_del_address
'address': addr})
File "/home/jlinkes/vpp/test/vpp_papi_provider.py", line 185, in api
raise UnexpectedApiReturnValueError(msg)
UnexpectedApiReturnValueError: API call failed, expected 0 return value instead of -127 in sw_interface_add_del_address_reply(_0=89, context=1922, retval=-127)

==============================================================================
FAIL: GBP L3 Endpoint Learning
------------------------------------------------------------------------------
Traceback (most recent call last):
File "/home/jlinkes/vpp/test/test_gbp.py", line 2362, in test_gbp_learn_l3
self.assertTrue(find_gbp_endpoint(self, ip=rep_2.ip4.address))
AssertionError: False is not true

Ran 5 tests in 70.348s

FAILED (failures=1, errors=1)
05:27:58,654 Link to the failed test already exists: /tmp/vpp-failed-unittests/vpp-unittest-TestGBP-CvZ439-FAILED -> vpp-unittest-TestGBP-CvZ439

For reference, the previous failure:

There are some missing packets in the regular build:
==============================================================================
GBP Test Case
==============================================================================
Group Based Policy OK
GBP L2 Endpoint Learning ERROR [ temp dir used by test case: /tmp/vpp-unittest-TestGBP-O2JBOn ]
GBP L3 Endpoint Learning OK
GBP L2 Endpoint w/ VLANs OK

==============================================================================
ERROR: GBP L2 Endpoint Learning
------------------------------------------------------------------------------
Traceback (most recent call last):
File "/home/jlinkes/vpp/test/test_gbp.py", line 1538, in test_gbp_learn_l2
rxs = self.send_and_expect(self.pg0, p * 17, self.pg2)
File "/home/jlinkes/vpp/test/framework.py", line 948, in send_and_expect
rx = output.get_capture(len(pkts))
File "/home/jlinkes/vpp/test/vpp_pg_interface.py", line 242, in get_capture
raise Exception("No packets captured on %s" % name)
Exception: No packets captured on pg2

The first two learning seem to have been successful:
06:32:26,453 CLI: sh l2fib bd_id 1
06:32:26,463 Mac-Address BD-Idx If-Idx BSN-ISN Age(min) static filter bvi Interface-Name
00:00:11:11:11:01 1 27 0/0 no * - - vxlan_gbp_tunnel0
00:11:22:33:44:55 1 10 0/0 no * - * loop0
00:00:11:11:11:02 1 27 0/0 no * - - vxlan_gbp_tunnel0
02:01:00:00:ff:02 1 1 0/0 no * - - pg0
L2FIB total/learned entries: 4/0 Last scan time: 2.0589e-3sec Learn limit: 4194304

But the first "Static EP replies to dynamics" fails:
06:32:26,630 Expecting to capture 17 (based on provided argument) packets on pg2
06:32:26,631 Waiting for capture file /tmp/vpp-unittest-TestGBP-k2bs4U/pg2_out.pcap to appear, timeout is 1s
06:32:27,631 Timeout - capture file still nowhere
06:32:27,632 — addError() TestGBP.test_gbp_learn_l2( GBP L2 Endpoint Learning ) called, err is (<type 'exceptions.Exception'>, Exception('No packets captured on pg2',), <traceback object at 0xffff3c26cef0>)
06:32:27,636 formatted exception is:
Traceback (most recent call last):
File "/usr/lib/python2.7/unittest/case.py", line 329, in run
testMethod()
File "/home/jlinkes/vpp/test/test_gbp.py", line 1537, in test_gbp_learn_l2
rxs = self.send_and_expect(self.pg0, p * 17, self.pg2)
File "/home/jlinkes/vpp/test/framework.py", line 948, in send_and_expect
rx = output.get_capture(len(pkts))
File "/home/jlinkes/vpp/test/vpp_pg_interface.py", line 242, in get_capture
raise Exception("No packets captured on %s" % name)
Exception: No packets captured on pg2