serverversion.py fails to parse YugabyteDB version

[FranckPachot]

• asyncpg version: EdgeDB server 1.0-beta.2+ga7130d5c7.cv202104290000
• PostgreSQL version: PostgreSQL 11.2-YB-2.7.1.1-b0 (YugabyteDB)
• Do you use a PostgreSQL SaaS? If so, which? Can you reproduce
  the issue with a local PostgreSQL install?: YugabyteDB
• Python version: 3.9
• Platform: OL8
• Do you use pgbouncer?: no
• Did you install asyncpg with pip?: no
• If you built asyncpg locally, which version of Cython did you use?: no
• Can the issue be reproduced under both asyncio and
  uvloop?:

YugabyteDB is a PostgreSQL compatible open source distrtibuted database. The format of the version is:

yugabyte=# select version();                                                                                                                          
                                                  version
------------------------------------------------------------------------------------------------------------
 PostgreSQL 11.2-YB-2.7.1.1-b0 on x86_64-pc-linux-gnu, compiled by gcc (Homebrew gcc 5.5.0_4) 5.5.0, 64-bit
(1 row)

This doesn't parse:

    /usr/lib/x86_64-linux-gnu/edgedb-server-1-beta2/lib/python3.9/site-packages/asyncpg/connection.py, line 86, in __init__
        > serverversion.split_server_version_string(ver_string)
    /usr/lib/x86_64-linux-gnu/edgedb-server-1-beta2/lib/python3.9/site-packages/asyncpg/serverversion.py, line 50, in split_server_version_string
        > versions = [int(p) for p in parts][:3]
    /usr/lib/x86_64-linux-gnu/edgedb-server-1-beta2/lib/python3.9/site-packages/asyncpg/serverversion.py, line 50, in <listcomp>
        > versions = [int(p) for p in parts][:3]

ValueError: invalid literal for int() with base 10: '2-YB-2'
Exception ignored in: <function Connection.__del__ at 0x7f695f6c5790>
Traceback (most recent call last):
  File "/usr/lib/x86_64-linux-gnu/edgedb-server-1-beta2/lib/python3.9/site-packages/asyncpg/connection.py", line 112, in __del__
AttributeError: _source_traceback
ERROR: Could not bootstrap EdgeDB server instance.
[opc@yb0 ~]$

Many distributions change the version text. Maybe better to split on any non-numeric character. Or use current_setting('server_version_num') which is an integer (as suggested in #256 )
Or as a short workaround add:

version_string = version_string.split('-')[0]

to:

version_string = version_string.split(' ')[0]

[elprans]

Duplicate of #771.