In AccountSetupCheckSettings.onCreate(Bundle), the account settings are
checked.
If an AuthenticationFailedException occurs, A dialog saying "Username or
password incorrect." pops up. We don't want to say this if the cause is
not related to an incorrect user name or password. Instead we want to say
the more generic "Cannot connect to server" which pops up for other
exception types.
This commit attempts to eliminate the use of AuthenticationFailedException
in instances where it could not be due to "Username or password
incorrect."
CRAM-MD5 (RFC 2195) permits 8-bit data but does not identify its encoding.
Since ASCII does not permit 8-bit data, this commit changes the encoding
to UTF-8.
There is an expired Internet-Draft that proposed that the RFC be changed
to explicitly require UTF-8 encoding of user names and shared secrets.
(But then there's also an expired draft proposing that CRAM-MD5 be retired
to historic status.)
Instead of CRAM-MD5, a better option for users is the SASL PLAIN mechanism
(within TLS) which explicitly permits UTF-8.
