extension: check the command attributes using `sysstr` Since we are checking attributes, lets use the native representation instead of bytes.

extension: access special module members using sysstr These extensions variables and mapping are module attributes so they should be dealt with unicode `str` in Python 3. We move the part that deal with reading theses variable and checking their validity to use unicode `str` string.

sshpeer: convert command name to sysstr before accessing method Method name are `str` so we should pass them as `str`.

localrepo: purge filecache attribute using there unicode name This could be better, but that's a good step.

fastannotate: use sysstr to check for attribute presence We do not need bytes here.

fastannotate: use sysstr to deal with some attributes We are now Python3 only and attribute are always unicode string. So no needs to managed them using bytes.

hgweb: use sysstr to set attribute on diff option Attribute identifier should be `str` not `bytes`.

hgweb: use sysstr to get attribute on diff option Attribute identifier should be `str` not `bytes`.

diff-option: move attributes handling to sysstr Attributes are `str` and should be handled as such.

compression: use sysstr to specify attribute to fetch for priority These are attributes so they should be `str`.

smartset: set attribute using sysstr instead of bytes We do not needs bytes here.

cachedlocalrepo: use sysstr for attribute name of "file of interest" The first item is an attribute name, the second one is a filename. So the first one can (and should) be a `str`.

terse-status: use `sysstr` to specify attributes to set We use unicode string to specify attribute and we add a explicit char for the other usage.

path-suboption: deprecated specifying the attributes as bytes The known suboptions have been updated, so we can deprecated passing bytes in case some extensions use them.

path-suboption: use str for "_pushloc" suboptions That second argument refer to an attribute and do not needs to be bytes.

path-suboption: use str for "pushrev" suboptions That second argument refer to an attribute and do not needs to be bytes.

path-suboption: use str for "bookmarks_mode" suboptions That second argument refer to an attribute and do not needs to be bytes.

path-suboption: use str for "delta_reuse_policy" suboptions That second argument refer to an attribute and do not needs to be bytes.

path-suboption: use str for "multi_urls" path suboptions That second argument refer to an attribute and do not needs to be bytes.

convert: use sysstr to check for attribute presence We do not need bytes here.

mq: use sysstr to check for attribute access We do not need bytes here.

lfs: use sysstr to check for attribute presence We do not need bytes here.

mq: use sysstr to check for attribute presence We do not need bytes here.

relink: use sysstr to check for attribute presence We do not need bytes here.